Marine Animals

3. A bell-shaped, free-swimming cnidarian form, like a jellyfish.
6. Eggs with a protective shell and internal membranes that allow them to be laid on land.
8. Organisms that live on or in the seafloor/lake floor.
10. Body parts arranged around a central point, like spokes on a wheel.
12. An organ in pregnant mammals that connects the developing fetus to the uterine wall for nutrient uptake and waste removal.
13. Body can be divided into two matching left and right halves.
18. A hydraulic system used by echinoderms for movement, feeding, and gas exchange.
19. Animals that have a backbone or spinal column.
20. Animals that produce their own body heat internally.

1. A type of asexual reproduction where a new organism grows out of the body of the parent.
2. A lack of equality or equivalence between parts or aspects of something; lack of symmetry.
4. Animals that rely on external environmental temperatures to regulate their body heat.
5. A gas-filled organ in fish that helps them control their buoyancy.
7. An organism that has both functional male and female reproductive organs.
9. A firm, flexible connective tissue that makes up the skeleton in some fish and joints.
11. Specialized glands in mammals that produce milk to nourish their young.
14. An internal skeleton that supports the body, made of bone or cartilage.
15. The process of shedding an exoskeleton to allow for growth.
16. Animals that lack a backbone or vertebral column.
17. A tube-shaped, sedentary (attached) cnidarian form, like a sea anemone or coral.
21. A hard outer shell that protects and supports the body.