Across
- 3. Bladder A gas-filled sac in bony fish used to maintain buoyancy.
- 9. An animal without a backbone.
- 10. Symmetry A body plan with two mirrored halves.
- 11. A body plan with no balanced or mirror-image shape.
- 15. The free-swimming, bell-shaped life stage of a cnidarian.
- 20. Animals that generate their own body heat internally.
- 21. An internal skeleton or supporting framework.
Down
- 1. A firm, flexible connective tissue.
- 2. Eggs Eggs with specialized membranes that allow for development on land.
- 4. An animal with a backbone or spinal column.
- 5. Vascular System A system of fluid-filled tubes used by echinoderms for movement.
- 6. An organism that possesses both male and female reproductive organs.
- 7. Animals that rely on external environment heat to regulate body temperature.
- 8. The process of shedding an old exoskeleton to grow a new one.
- 12. Glands Organs in female mammals that produce milk for their young.
- 13. An organ that provides oxygen and nutrients to a fetus.
- 14. Asexual reproduction where a new organism grows as an outgrowth of the parent.
- 16. A hard protective structure on the outside of the body.
- 17. Living on or in the bottom of a body of water.
- 18. Symmetry A body plan where parts are arranged around a central axis.
- 19. The stationary, tube-like life stage of a cnidarian.