1. Describe two ways in which the respiratory and circulatorysystems have been modified in mammals that dive to greatdepths.

2. Explain how your biceps muscle functions (at all levels) to pullyour forearm towards your upper arm.

3. Explain how an electrical impulse is propagated along a neuron.

4. How does black carbonpollution compare to automobile pollution?

5. What of the following is NOT a function of the pancreas?

6. Describe the fluidity of cell membrane