Across
- 3. Bladder An organ that helps fish float at different depths.
- 9. An animal without a backbone.
- 10. Symmetry A body that can be split into two matching halves.
- 11. No regular shape or matching sides.
- 15. A jellyfish-shaped animal that swims freely.
- 20. An animal that keeps its body warm using internal heat.
- 21. A skeleton inside the body.
Down
- 1. Strong, flexible tissue found in places like the nose and ears.
- 2. Eggs Eggs that protect the developing animal inside.
- 4. An animal with a backbone.
- 5. Vascular System A system that helps certain sea animals move.
- 6. An animal with both male and female reproductive parts.
- 7. An animal that depends on outside heat to warm its body.
- 8. To shed an old outer covering.
- 12. Glands Organs that produce milk for babies.
- 13. An organ that gives a developing baby oxygen and nutrients.
- 14. When a new organism grows from its parent.
- 16. A hard outer covering that protects the body.
- 17. Living at the bottom of a body of water.
- 18. Symmetry Body parts arranged around a center.
- 19. A tube-shaped animal that stays attached to a surface.