What is the main concern with regard to hormone blockers, and where do they come from?
What will be an ideal response?
Hormone blockers can disrupt the action of the endocrine system by interfering with natural hormone balance. Hormone blockers can interfere with the sex hormones of males and females, and they can affect sexual development and reproduction. Examples of hormone blockers include certain herbicides, DDT, PCBs, and mercury.
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An oxygen sag curve describes how oxygen in a body of water is consumed by organisms, such as fish.
Answer the following statement true (T) or false (F)
What happens to water velocity downstream? It generally 
A. increases. B. remains the same. C. decreases. D. There is no way to tell because discharge cannot be determined.
The physical breakdown of a rock into smaller pieces is called
A. Mechanical weathering B. Sedimentation C. Abrasion D. The rock cycle E. Chemical weathering
Outputs of hazardous waste can be reduced by relying less on ____ and more on ____.
A. fossil fuels; nuclear energy B. fossil fuels; renewable energy C. preventative strategies; renewable energy D. governments; citizens E. citizens; governments