Ch. 39 Part 1

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