32. It is its harmful effects on human health and on the food chain of animals, birds, and marine life. (Line 1: The most serious result of pollution is its harmful effects on human health and on the food chain of animals, birds, and marine life.)

33. It refers to pollution.

34. No, they aren't. (Line 5 and 6: Most pesticides are nonselective.)

35. Because it kills surface-swimming animals and sea birds and once it settles on the bottom, it harms shellfish and other types of marine life (Line 11 and 12: It kills surface-swimming animals and sea birds and once it settles on the bottom, it harms shellfish and other types of marine life.)

36. "Pollution" is the word in the text has the same as "contamination"

- Pollution (n.) = contamination (n.) ô nhiễm

32. It is harmful effects on human health and on the food chain of animals, birds, and marine life. (dòng 1)

33. It refers pollution.

34. No, they aren't. (dòng 5 và 6)

35. Because it kills surface-swimming animals and sea birds and once it settles on the bottom (dòng 11 và 12)

36. Pollution 

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