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To subscribe, E-mail the words . . In loving detail, Rodricks's book describes all the theoretical steps in a risk assessment. This week and next, we will discuss these 4 points. As Rodricks's book illustrates, the government often doesn't even know what toxic effects to test for. The endocrine system, in wildlife and humans, is a complex set of bodily organs and tissues whose activities are coordinated by chemical messengers called hormones, which control growth, development and behavior.