Question

read the passage. then, select the text that best helps you understand the meaning of adverse. published in 1962, rachel carsons silent spring began a national debate that changed americans attitudes toward the environment. carson, originally a marine biologist, had begun noticing the adverse effects of pesticides on various ecosystems. in her book, she documents the effects of ddt, a pesticide that was then popular for agricultural use. for example, carson noted the collapse of food chains and the decline of bird, fish, and other animal populations. the books central claim was highly controversial. nevertheless, taking the books message to heart, conservationists succeeded in banning the use of ddt in the united states in 1972. what is the meaning of adverse as used in the passage? valuable harmful intended subtle

Explanation:

The passage mentions collapse of food - chains and decline of animal populations as effects of pesticides. These are negative impacts, so "adverse" means harmful.

Answer:

B. harmful