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1/ Hydrocarbon is the most widely popular compound of hydrogen and carbon that exists in nature.
2/ To obtain to derivatives of benzene, carbon atoms can be replaced by other groups of substances.
3/ Raw materials are used for production and to make products.
4/ In chemical industry, the distinction between selling products and the last product is quite difficult.
5/Chemical compound is separated into 2 types: Inorganic compound and Organic compound.
Previously, students did not have computers to use as they are now, so they calculated themselves without any support devices. That helps to train the thinking for each student. But now science and technology is growing and the advent of computers has made people less thoughtful. So science has made people change
Bạn trả lời có tâm nhưng tôi thấy bạn toàn copy câu trả lời của người khác, gợi ý cho bạn là: đừng copy latex nhé, copy các kí tự đặc biệt thì đừng hỏi tại sao lại có những ''ô hỏi chấm'' nhé!
bn phải trl nhanh nhất, đúng nhất là một chuyện còn phải có tâm nữa
Bạn điền thông tin vào biểu mẫu này nha: https://forms.gle/U1zKa4DXRdQqBNqT7! Ngày khai giảng và 29/7/2021 nhé!
Genetically modified mosquitoes drop Zika virus can cause many consequences
The release of genetically modified mosquitoes into the wild to prevent disease spread by mosquitoes, such as Zika virus, malaria, dengue fever is premature and could cause unintended consequences.
This is the warning of the US scientists released on 9/6.
Professor James Collins of Arizona State University, and a co-chairman of the Commission of the national academy of science, engineering and medicine, affirmed should be cautious and conduct more studies of the consequences of social, scientific as well as the release of genetically modified organisms into the environment.
Commission warns on genetically modified technology could cause harmful effects such as reducing the number of other insects, or even more dangerous is the creation of new species capable of rapid spread of disease than.
The researchers called for further studies conducted, the tests in stages and closer collaboration between scientists.
bạn dùng google dịch à?