D2L Marine Biology

5. Organ in most mammals that passes nutrients from mother to baby during pregnancy.
9. An organism with both male and female reproductive organs.
10. Cnidarian body form that is tube-shaped and sessile (stays in one place).
11. Shedding the old exoskeleton to grow a new, bigger one.
14. Cold-blooded; body temperature changes with the environment.
17. Asexual reproduction where a new organism grows off the parent.
18. Living on or in the ocean floor.
20. Glands in mammals that produce milk to feed young.
21. A system in echinoderms (like sea stars) that moves water to help with movement and feeding.

1. No body symmetry or regular shape.
2. Body can be divided into two equal halves (left and right).
3. Internal skeleton made of bone or cartilage.
4. Animal with a backbone.
6. Warm-blooded; body temperature stays stable (like in birds and mammals).
7. Body parts arranged around a central point (like a starfish).
8. Eggs with a protective shell and fluid, laid on land by reptiles, birds, and some mammals.
12. Cnidarian body form that is bell-shaped and free-swimming (like a jellyfish).
13. Gas-filled organ in fish that helps control buoyancy.
15. Flexible tissue found in joints and some skeletons (like sharks).
16. Hard outer covering that protects and supports an animal (like a crab).
19. Animal without a backbone.