| A | B |
|---|
| vertebrate | Animals with a backbone. |
| invertebrate | Animals lacking a backbone. |
| symmetry | Arrangement of the individual parts of an object. |
| cnidarian | Phylum of hollow-bodied, water-dwelling animals with stinging cells, radial symmetry, a body two layers thick, and both sexual and asexual reproduction. |
| polyp | Vase-shaped body plan of a cnidarian, that allows it to twist to capture prey and to somersault to a new location. |
| medusa | Free-swimming, bell-shaped body plan of a cnidarian, that allows it to drift with the ocean currents. |
| free-living | Organism that doesn't depend on one particular organism for food or a place to live. |
| parasite | Organism that depends on its host for food and a place to live. |
| mollusk | Soft-bodied invertebrate that has a mantle, a large muscular foot, a complete digestive system with two openings, and usually has a protective shell. |
| mantle | Thin tissue layer covering a mollusk's soft body. Secretes the protective shell of mollusks having a shell. |
| gills | Organs that exchange oxygen and carbon dioxide in water. |
| radula | Scratchy,tongue-like organ in many mollusks that acts like a file with rows of teeth to break up food into smaller pieces. |
| open circulatory system | Type of blood-circulation system in which the blood is not contained in vessels but instead surrounds the organs. |
| arthropod | Animals that have jointed appendages, is classified by the number of body segments and appendages, and has a protective exoskeleton. |
| appendage | Jointed structure that grows from a body. (ex: legs, claws, antennae) |
| exoskeleton | Lightweight body covering that protects and supports an arthropod's body, preventing it from drying out. It is shed by molting. |
| metamorphosis | Process in which insects change their body form as they mature. |
| bilateral symmetry | Animals that have mirror image body parts. |
| radial symmetry | Animals that have body parts arranged in a circle around a central point. |
| asymmetrical | Animals that have no definite shape. |
| complete metamorphosis | Egg, Larva, Pupa, Adult |
| incomplete metamorphosis | Egg, Nymph, Adult |
| closed circulatory system | Type of blood-circulation system in which the blood is contained in vessels. |
| heterotroph | An organism that cannot make its own food. |
| herbivore | An organism that eats plants. |
| carnivore | An organism that eats other animals. |
| omnivore | An organism that eats plants and animals. |
| motile | Can move from place to place. |
| sessile | Cannot move. Is attached to a substrate. |
| eukaryotic | Cells that have a nucleus and organelles. |
