vertebrate diversity

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Across
  1. 4. produce eggs and sperms
  2. 8. skeletal system in birds
  3. 9. shell
  4. 10. respiratory system of birds
  5. 12. for grinding food
  6. 13. line sensation in fish
  7. 15. movement of mollusks
  8. 16. lower chambers
Down
  1. 1. bladder controls fish depth
  2. 2. skeleton of worms
  3. 3. large jaws and sharp scales
  4. 5. bird heart
  5. 6. sac for wastes in bird
  6. 7. birds wastes
  7. 10. waste of fish
  8. 11. has no scales or jaws
  9. 14. amphibian heart
  10. 17. fish heart