Which of the following components is present in the troposphere?

Which of the following is a major component of water pollution?

Which is the greatest source of air pollution these days?

$A$ farmer is using pesticides in his field. He uses the produce from his field as food for fish. He is told that the fish are not fit for human consumption because large amounts of pesticides were found in the fish cells. How is this possible? Explain.

Which of the following gases is not a greenhouse gas?

Methyl mercaptans are generated as waste from which industry?