Across
- 4. biological name for birds
- 5. nourish the baby inside the mother's body
- 7. lay eggs
- 9. the phylum vertebrates belong to
- 11. body varies with the temperature of the water
- 12. bony fish
- 13. live in and out of water
Down
- 1. jawless fish
- 2. give birth to live young
- 3. dry scaly skin
- 6. skeleton is made of cartilage
- 8. skeletons inside their body
- 10. give birth to a tiny undeveloped baby