Across
- 5. change
- 6. the number degrees of heat
- 8. lives in water
- 9. fish breathe with these
- 10. fish use these to swim
Down
- 1. where an animal lives
- 2. opposite of land
- 3. reptile's outer skin
- 4. alligator, crocodile, salamander
- 7. mammals breate with these