Animal Crossword Puzzle

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Across
  1. 3. Bladder Gas filled organ for buoyancy
  2. 9. Animal without a backbone
  3. 10. Symmetry Mirror image halves along one plane
  4. 11. Lack of symmetry
  5. 15. Free swimming umbrella shaped cnidarian
  6. 20. Organism that regulates body temperature internally
  7. 21. Internal skeleton for support
Down
  1. 1. Flexible connective tissue
  2. 2. Eggs Eggs with protective membranes
  3. 4. Animal with a backbone
  4. 5. Vascular System Fluid filled canals in echinoderms
  5. 6. Organism with both sexes
  6. 7. Organism that relies on external heat
  7. 8. Shedding of an outer layer
  8. 12. Glands Glands that produce milk
  9. 13. Organ connecting fetus to maternal blood supply
  10. 14. Asexual reproduction via outgrowth
  11. 16. Hard outer structure for support
  12. 17. Relating to the ocean floor
  13. 18. Symmetry Symmetry around a central axis
  14. 19. Sessile cylindrical cnidarian form