An ant is clinging to one corner of a box in the shape of a cube. The ant wants to get to the most distant corner of the box by crawling only along the edges of the cube and without ever revisiting a...

PG

Phong Gió

17 tháng 2 2020 - olm

An ant is clinging to one corner of a box in the shape of a cube. The ant wants to get to the most distant corner of the box by crawling only along the edges of the cube and without ever revisiting a place it has been. How many different paths can the ant take to the most distant corner?

#Toán lớp 8

0

LQ

Lê Quỳnh Anh

28 tháng 7 2019

Read the following passage and mark the letter A, 8, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42. Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger to the ground and depositing a tiny amount of...

Đọc tiếp

Read the following passage and mark the letter A, 8, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42.

Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone - a mixture of chemicals that delivers diverse messages as the context changes. These trails incorporate no directional information and may be followed by other ants in either direction.

Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.

The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space.

The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail.

Question 40: The author mentions the trail pheromone of the leafcutter ant in paragraph 2 to point out ______.

A. a type of ant that is common in many parts of the world

B. how little pheromone is needed to mark a trail

C. the different types of pheromones ants can produce

D. that certain ants can produce up to one milligram of pheromone

#Mẫu giáo

1

DH

Dương Hoàn Anh

28 tháng 7 2019

Đáp án B

Tác giả đề cập đến dấu vết pheromone của kiến cắn lá ở đoạn 2 để chỉ ra ______.

A. Một loại kiến phổ biến ở nhiều nơi trên thế giới

B. Cần rất ít Pheromone để đánh dấu một dấu vết

C. Các loại pheromones khác nhau ma kiến có thể sản sinh

D. Một số kiến có thể sản sinh đến một miligarn pheromone

Căn cứ vào thông tin trong câu sau:

“Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would sufﬁce to lead a column of ants three times around Earth.” (Các nhà điều tra làm việc với dấu vết pheromone của loài kiến cắn lá Atto texono tính toán rằng một miiigarn của chất này sẽ đủ để dẫn một dãy kiến đi ba lần vòng quanh Trái đất.)

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Lê Quỳnh Anh

12 tháng 8 2019

Read the following passage and mark the letter A, B, C or B on your answer sheet to indicate the correct answer to each of the questions from 30 to 37. Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route Line by intermittently touching its stinger to the ground and depositing a tiny...

Đọc tiếp

Read the following passage and mark the letter A, B, C or B on your answer sheet to indicate the correct answer to each of the questions from 30 to 37.

Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route Line by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone – a mixture of chemicals that delivers diverse messages as the context changes.

These trails incorporate no directional information and may be followed by other ants in either direction. Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth. The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space. The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail.

The author mentions the trail pheromone of the leafcutter ant in line 11 to point out

A. how little pheromone is needed to mark a trail

B. the different types of pheromones ants can produce

C. a type of ant that is common in many parts of the world

D. that certain ants can produce up to one milligram of pheromone

#Mẫu giáo

1

DH

Dương Hoàn Anh

12 tháng 8 2019

Đáp án A

Tác giả đề cập đến dấu vết pheromone của kiến cắn lá ở dòng 11 để chỉ ra

A. cần rất ít Pheromone để đánh dấu một dấu vết

B. các loại pheromones khác nhau mà kiến có thể sản sinh

C. một loại kiến phổ biến ở nhiều nơi trên thế giới

D. Một số kiến có thể sản sinh đến một miligam pheromone

Dẫn chứng: Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.

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LQ

Lê Quỳnh Anh

14 tháng 4 2017

Read the following text and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questionsMany ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone –...

Đọc tiếp

Read the following text and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions

Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone – a mixture of chemicals that delivers diverse messages as the context changes. These trails incorporate no directional information and may be followed by other ants in either direction.

Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.

The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space.

The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail.

The author mentions the trail pheromone of the leafcutter ant in paragraph 2 to point out

A. a type of ant that is common in many parts of the world

B. how little pheromone is needed to mark a trail

C. the different types of pheromones ants can produce

D. that certain ants can produce up to one milligram of pheromone

#Mẫu giáo

1

DH

Dương Hoàn Anh

14 tháng 4 2017

B

Kiến thức: Đọc hiểu

Giải thích:

Tác giả đề cập đến dấu vết pheromone của kiến cắn lá ở đoạn 2 để chỉ ra

A. một loại kiến phổ biến ở nhiều nơi trên thế giới

B. cần rất ít Pheromone để đánh dấu một dấu vết

C. các loại pheromones khác nhau mà kiến có thể sản sinh

D. Một số kiến có thể sản sinh đến một miligam pheromone

Thông tin: Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.

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DM

Dương Minh

30 tháng 1 2019

Read the following text and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone...

Đọc tiếp

Read the following text and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions

Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone – a mixture of chemicals that delivers diverse messages as the context changes. These trails incorporate no directional information and may be followed by other ants in either direction.

Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.

The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space.

The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail.

The author mentions the trail pheromone of the leafcutter ant in paragraph 2 to point out

A. a type of ant that is common in many parts of the world

B. how little pheromone is needed to mark a trail

C. the different types of pheromones ants can produce

D. that certain ants can produce up to one milligram of pheromone

#Mẫu giáo

1

NH

Nguyen Hoang Hai

30 tháng 1 2019

B

Kiến thức: Đọc hiểu

Giải thích:

Tác giả đề cập đến dấu vết pheromone của kiến cắn lá ở đoạn 2 để chỉ ra

A. một loại kiến phổ biến ở nhiều nơi trên thế giới

B. cần rất ít Pheromone để đánh dấu một dấu vết

C. các loại pheromones khác nhau mà kiến có thể sản sinh

D. Một số kiến có thể sản sinh đến một miligam pheromone

Thông tin: Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.

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LQ

Lê Quỳnh Anh

14 tháng 11 2017

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger on the ground and depositing a tiny amount of trail...

Đọc tiếp

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger on the ground and depositing a tiny amount of trail pheromone - a mixture of chemicals that delivers diverse messages as the context changes. These trails incorporate no directional information and may be followed by other ants in either direction.

Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Attatexana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.

The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space. The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail.

The author mentions the trail pheromone of the leafcutter ant in the second paragraph to point out________.

A. how little pheromone is needed to mark a trail

B. the different types of pheromones ants can produce

C. that certain ants can produce up to one milligram of pheromone

D. a type of ant that is common in many parts of the world

#Mẫu giáo

1

DH

Dương Hoàn Anh

14 tháng 11 2017

A

Thông tin ở câu cuối đoạn số 2: “Investigators working with the trail pheromone of the leafcutter ant Attatexana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.” (...1 mg hợp chất này cũng đã đủ để dẫn đầu/làm đầu mối cho một toán kiến 3 lần quanh trái đất)

Tức là how little pheromone is needed to mark a trail: chỉ cần một lượng hợp chất nhỏ cũng đủ để đánh dấu vết

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Lê Quỳnh Anh

28 tháng 5 2018

Read the following passage and mark the letter A, 8, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42. Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger to the ground and depositing a tiny amount of...

Đọc tiếp

Read the following passage and mark the letter A, 8, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42.

Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone - a mixture of chemicals that delivers diverse messages as the context changes. These trails incorporate no directional information and may be followed by other ants in either direction.

Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.

The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space.

The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail.

Question 42: According to the passage, the highest amount of pheromone vapor is found

A. in the source of food

B. in the receptors of the ants

C. under the soil along the trail

D. just above the trail

#Mẫu giáo

1

DH

Dương Hoàn Anh

28 tháng 5 2018

Đáp án D

Theo đoạn văn, lượng pheromone cao nhất được tìm thấy_________.

A. trong nguồn thức ăn B. trong các thụ thể của kiến

C. dưới đất dọc theo dấu vết D. ngay phía trên dấu vết

Căn cứ vào thông tin trong câu sau:

“A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail,” (Một dấu vết pheromone sẽ bay hơi để cung ứng nồng đó hơi cao nhất trên dấu vết.)

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LQ

Lê Quỳnh Anh

28 tháng 12 2018

Read the following passage and mark the letter A, B, C or B on your answer sheet to indicate the correct answer to each of the questions from 30 to 37. Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route Line by intermittently touching its stinger to the ground and depositing a tiny...

Đọc tiếp

Read the following passage and mark the letter A, B, C or B on your answer sheet to indicate the correct answer to each of the questions from 30 to 37.

Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route Line by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone – a mixture of chemicals that delivers diverse messages as the context changes.

These trails incorporate no directional information and may be followed by other ants in either direction. Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth. The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space. The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail.

According to the passage, the highest amount of pheromone vapor is found

A. in the receptors of the ants

B. just above the trail

C. in the source of food

D. under the soil along the trail

#Mẫu giáo

1

DH

Dương Hoàn Anh

28 tháng 12 2018

Đáp án B

Theo đoạn văn, lượng pheromone cao nhất được tìm thấy

A. trong các thụ thể của kiến

B. ngay phía trên dấu vết

C. trong nguồn thức ăn

D. dưới đất dọc theo dấu vết

Dẫn chứng: A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail

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LQ

Lê Quỳnh Anh

22 tháng 12 2018

Read the following passage and mark the letter A, B, C ,or D on your answer sheet to indicate the correct answer for each of the questions. Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger to the ground and depositing a tiny amount of...

Đọc tiếp

Read the following passage and mark the letter A, B, C ,or D on your answer sheet to indicate the correct answer for each of the questions.

Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone – a mixture of chemicals that delivers diverse messages as the context changes. These trails incorporate no directional information and may be followed by other ants in either direction.

Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.

The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space. The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail.

The author mentions the trail pheromone of the leafcutter ant in line 11 to point out

A. how little pheromone is needed to mark a trail

B. the different types of pheromones ants can produce

C. a type of ant that is common in many parts of the worl

D. that certain ants can produce up to one milligram of pheromone

#Mẫu giáo

1

DH

Dương Hoàn Anh

22 tháng 12 2018

Đáp án A

Dịch: Tác giả đề cập đến đường dấu pheromones của loài kiến cắt lá ở dòng 11 để chỉ ra rằng

A. Cần rất ít pheromones để đánh dấu một đường

B. Những loài pheromones khác nhau mà kiến có thể tạo ra

C. Một loài kiến phổ biến ở nhiều nơi trên thế giới

D. Chỉ một số loài kiến nhất định mới có thể tạo ra đến 1 miligram pheromones

Thông tin nằm ở đoạn 2: Investigators working with the trail pheromone of the leafcutter ant Attatexana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth (Các nhà điều tra làm việc với các đường dấu pheromone của kiến cắt lá Attatexana đã tính rằng một miligam của chất này sẽ đủ để dẫn một hàng kiến dài bằng ba lần Trái đất). Chỉ rất ít chất đó mà dẫn được rất nhiều kiến, do đó ta chọn được A.

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LQ

Lê Quỳnh Anh

25 tháng 6 2017

Read the following passage and mark the letter A, B, C ,or D on your answer sheet to indicate the correct answer for each of the questions. Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route Line by intermittently touching its stinger to the ground and depositing a tiny amount of...

Đọc tiếp

Read the following passage and mark the letter A, B, C ,or D on your answer sheet to indicate the correct answer for each of the questions.

Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route Line by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone – a mixture of chemicals that delivers diverse messages as the context changes.

These trails incorporate no directional information and may be followed by other ants in either direction. Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.

The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space. The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail.

The author mentions the trail pheromone of the leafcutter ant in line 11 to point out

A. how little pheromone is needed to mark a trail

B. the different types of pheromones ants can produce

C. a type of ant that is common in many parts of the world

D. that certain ants can produce up to one milligram of pheromone

#Mẫu giáo

1

DH

Dương Hoàn Anh

25 tháng 6 2017

A

Tác giả đề cập đến dấu vết pheromone của kiến cắn lá ở dòng 11 để chỉ ra

A. cần rất ít Pheromone để đánh dấu một dấu vết

B. các loại pheromones khác nhau mà kiến có thể sản sinh

C. một loại kiến phổ biến ở nhiều nơi trên thế giới

D. Một số kiến có thể sản sinh đến một miligam pheromone

=> đáp án A

Thông tin: Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth

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