Across
- 3. The class perch, trout, and salmon.
- 7. What is is called when blood and water flow in the opposite direction in the respiratory system.
- 8. The class with sharks, skates, and rays.
Down
- 1. One of the three characteristics of fish.
- 2. Controls buoyancy of chondrichthyes fish.
- 4. One of the three characteristics of fish.
- 5. The class with lampreys and hagfish.
- 6. One of the three characteristics of fish.