Across
- 4. This type of fish has no scales
- 6. An insects skeleton is called ____
- 9. Has stiff hairs on the bottom of its body that helps with movement
- 12. movement
- 13. Some animals use their skin to ___ from predators
- 14. Make a protective covering on the outside of fish
- 15. Insects have how man legs
- 17. Many boneless animals are ____
Down
- 1. a lightweight, flat structure on the outside of a birds body
- 2. Sharp structures used by some animals for protection
- 3. Helps a fish move, steer, and balance
- 5. When it contracts, it pumps blood through the body
- 7. Many animals with no bones live in the _____
- 8. Protect soft animals such as oysters and clams
- 10. When a muscle pulls on this it moves
- 11. Structure that relaxes and contracts to
- 14. Helps a snail glide on the ground
- 16. Has hollow and flexible bones