Across
- 3. flexible material made of cells surrounded by protein
- 5. frogs salamanders toads
- 6. sharks rays skates
- 9. ability to detect chemicals in environment
- 11. allow fish to sense vibrations in water
- 15. hagfishes
- 16. lamprey
- 17. fills with air to maintain bouyancy
- 18. skeletal elements that support pharynx
Down
- 1. humans mice deer rats
- 2. lobe finned fish
- 4. birds
- 7. male impregnates female by injecting sperm into female
- 8. respiratory organs of fishes
- 10. small toothlike scales that feel like sandpaper
- 12. turtles snakes crocodiles
- 13. tapered at head and tail, shape of shark
- 14. ray finned fish