Across
- 2. has a backbone, includes all mammals, birds, reptiles, amphibians, and fish
- 3. relating to water
- 5. the larval stage in the biological life cycle of amphibians
- 7. meat-eating
- 9. any member of the group of vertebrate animals characterized by their ability to exploit both aquatic and terrestrial habitats. cold-blooded
Down
- 1. transforms from eggs to adult through distinct stages
- 4. relating to earth
- 6. allow fish to take in oxygen from the surrounding water
- 7. (skin surface) respiration
- 8. frogs and toads