Across
- 6. Animals without backbones
- 7. the phylum of sponges
- 9. insects, arachnids, millipedes and centipedes, and crustaceans
- 12. internal skeleton
- 13. skeleton A fluid skeleton in many soft-bodied invertebrates
- 14. external skeleton;
- 15. scientist who studies animals
- 18. invertebrates with soft, unsegmented bodies that are often protected by a hard outer shell
- 19. invertebrates with an internal skeleton and a system of fluid-filled tubes called a water vascular system
Down
- 1. has a notochord, a dorsal hollow nerve cord, and gill slits at some time in its life cycle
- 2. Animals that have hair and produce milk for their young
- 3. May or may not fly, with vertebra, lay eggs, have feathers
- 4. stinging cells
- 5. animals with backbones
- 8. Shells soft bodies, no vertebra and hard shells.
- 10. A segmented worm which include earthworms, polychaetes, and leeches
- 11. An ectothermic vertebrate that lives in the water and has fins.
- 16. organs that exchange oxygen and carbon dioxide with water
- 17. vertebrates that live in water and on land, smooth skin covers body, lay eggs, cold blooded