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