Vertebrates

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Across
  1. 3. tooth-like skin of a cartilaginous fish
  2. 5. takes oxygen from air
  3. 6. gives bony fish buoyancy
  4. 7. control body temperature through chemicals reactions of cells
  5. 8. ancestors of mammals
  6. 14. row of tiny organs that detects movements
  7. 17. animal with backbone
  8. 18. fluffy and helps birds stay warm
  9. 20. remove oxygen from water
  10. 21. change from larval to adult form
  11. 24. secrete a nutritious fluid
  12. 26. do not control body temperature
Down
  1. 1. makes sreamlined flying surface
  2. 2. muscle that brings air into lungs
  3. 4. time where embryo develops
  4. 9. protect a fishes body and reduces friction while swimming
  5. 10. protects and keeps embryo from drying out
  6. 11. mammals with pouches
  7. 12. process of spreading oil on feathers
  8. 13. embryos that stay inside the mothers body
  9. 15. upward force to keep birds in the air
  10. 16. make up the backbone
  11. 19. help fish move, steer, stop, and balance
  12. 22. process of sitting on eggs to keep them warm
  13. 23. aquatic larva of amphibian embryo
  14. 25. mammals that lay eggs