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1. Which of the following best describes the relationship of insulin and glucagon?
A. High levels of insulin inhibit pancreatic secretion of glucagon.
B. They work together to prepare the body to deal with stress.
C. Insulin stimulates the pancreas to secrete glucagon.
D. They are antagonistic hormones.

2. Why do sperm cells need to be bathed with fluids from the prostate gland and seminal vesicle?
A. The fluid serves as a medium in which the sperm cells move and survive. It also contains nutrients that nourish the sperm.
B. So that sperm can have a fresh and suitable environment.
C. For the sperm to swim properly.
D. For the sperm to live longer