marine animals

4. living venomous snakes in place of hair.
5. Eggs type of egg produced by reptiles, birds,
6. support and protect the body of some animals,
8. Bladder internal gas-filled organ that contributes to the ability of many bony fish
9. an organ that develops in your uterus during pregnancy
10. both kinds of reproductive organs and can produce both gametes
11. bottom of a body of water
13. animals with a backbone
15. Glands specialized organs that produce milk for feeding offspring in mammals,
16. Symmetry body shapes that are mirror images
17. Symmetry shape has when it looks the same after some rotation
19. System system of canals filled with a fluid consisting of sea-water and certain corpuscles.

1. external skeleton that supports and protects an animal's body
2. asexual reproduction
3. connective tissue forming the skeleton of mammalian embryos
4. shed hair, feathers, shell, horns, or an outer layer periodically
6. absorbing heat from the surroundings
7. having balanced or identical parts or elements.
12. without a backbone
14. cold-blooded, depend on external sources of heat to regulate their body temperature.
18. abnormal clump of cells that grow inside the body.