Animal Crossword Puzzle Creation

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