Amphibians

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Across
  1. 2. The number of their heart chambers
  2. 4. Where tadpoles start off
  3. 6. Respiratory organs for humans
  4. 8. The process of transformation from an immature form to an adult form in two or more distinct stages
  5. 12. Can't regulate their internal temperature
  6. 13. Having a backbone
  7. 15. Most amphibians' larvae are aquatic and ________
  8. 17. They begin life in water then move to ____
  9. 18. Amphibians can't live in
  10. 19. Smooth moist skin and long legs
  11. 20. Worm-like amphibian
Down
  1. 1. Two lives or double life
  2. 3. Amphibians have these skin colors to warn predators
  3. 5. They lay ___ to reproduce
  4. 7. A large phylum that consists of five classes
  5. 9. Mexican salamander
  6. 10. What their skin is like
  7. 11. Amphibians are an ______ _______
  8. 14. Lizard-like amphibian
  9. 16. Respiratory organs for animals like fish