Across
- 3. Bladder A gas-filled organ that helps fish maintain buoyancy.
- 9. An animal without a backbone.
- 10. Symmetry Symmetry where the body can be divided into two equal halves.
- 11. Lack of symmetry in an organism.
- 15. The free-swimming form of certain cnidarians, such as jellyfish.
- 20. Animals that can regulate their body temperature internally.
- 21. An internal skeleton that supports the body.
Down
- 1. A flexible, strong connective tissue found in joints and other parts of the body.
- 2. Eggs Eggs that have a protective membrane, allowing for terrestrial reproduction.
- 4. An animal with a backbone.
- 5. Vascular System A system of fluid-filled canals used by echinoderms for movement and feeding.
- 6. An organism that has both male and female reproductive organs.
- 7. Animals that rely on external sources of heat to regulate body temperature.
- 8. The process of shedding an old skin or outer covering.
- 12. Glands Glands that produce milk in mammals.
- 13. An organ in mammals that provides nutrients to a developing fetus
- 14. A form of asexual reproduction in which a new organism develops from an outgrowth of a parent.
- 16. A hard outer structure that supports and protects an animal’s body.
- 17. Referring to organisms that live on or near the seafloor.
- 18. Symmetry Symmetry around a central axis.
- 19. A stationary, tubular form of certain cnidarians.