1. Explain the difference between bony fish and cartilage fish

2. Why are sharks unable to stop swimming

3. Why are the gills divided up into filaments and not simply a solid structure

4. Explain counter current blood flow

5. What are 2 similarities between a human and a fish’s respiratory system

6. Describe how oxygen and carbon dioxide move

7. Why don’t fish take in water, absorb oxygen and expel it, like mammals do air

8. How do fish survive in such low oxygen environments

9. If fish require oxygen to survive, why do the suffocate outside water even though there is so much more oxygen in the air than in water?

10. Explain why some fish, such as gold fish are

      able to sit in one spot and survive but sharks

      are not.