Marine Biology

3. When the body plan can be divided along a plane that splits the animal's body into right and left sides that are mirror images of each other.
5. A sessile, hollow, cylindrical body form found in members of the phylum Cnidaria, characterized by a mouth surrounded by tentacles and a basal disk for attachment.
6. A hydraulic system used by echinoderms, such as sea stars and sea urchins, for locomotion, food and waste transportation, and respiration.
7. Any marine animal that lacks a backbone
11. The free-swimming, bell-shaped, sexual reproductive phase of cnidarians, like jellyfish, characterized by tentacles hanging down from the margin of the gelatinous body.
12. An organism that possesses both male and female reproductive organs, allowing it to produce both sperm and eggs, and can be either simultaneous or sequential.
13. A specialized organ that facilitates nutrient and gas exchange between a developing embryo and its mother.
14. Occurs when an organism can be divided by planes to produce roughly identical pieces, around a central axis, like pieces of a pie.
17. An animal with a backbone and a cranium.
18. An organism, like most-fish ad invertebrates, whose body temperature is determined by heat exchange with its surroundings, rather than internal metabolic processes.
19. A terrestrially adapted egg, characterized by a shell and extra-embryonic membranes.

1. An internal skeletal system, composed of bone or cartilage, that provides support and protection.
2. An exocrine gland in mammals that produces milk to nourish their young.
4. The process where marine arthropods, like crustaceans, shed their exoskeleton to allow for growth and development.
8. A lack of symmetry, where a body or structure is not identical on both sides of a central line.
9. Anything associated with or occurring on the bottom of water, including the seafloor and the organisms that live there.
10. A gas-filled organ in body fish that helps them maintain buoyancy, allowing them to stay at a desired depth without expending energy to swim.
15. A hard,external covering that supports and protects the body of invertebrate animals, providing protection and support for internal organs and tissues.
16. A strong, flexible, and semi-rigid connective tissue that forms the skeleton of certain marine animals, such as sharks and rays, and provides structural support and cushioning.
20. An animal that generates and controls its internal heat so that its body core temperature can be regulated at a level different than the ambient temperature.