| A | B |
|---|
| motile | able to move |
| exoskeleton | system of tough plates covering the outside of an animal |
| heterotroph | must find and consume food |
| sessile | fixed permanently to some object |
| endoskeleton | internal system of bones or cartilege |
| bilateral symmetry | divided into equal halves by a one imaginary plane, divided into left and right side |
| radial symmetry | any number of imaginary planes through the center, can divide animal into equal halves, body parts repeat around the center |
| coelomate | true body cavity |
| omnivore | feeds on plants and animals |
| asexual | reproduction that allow animal to be identical to parent |
| invertebrate | animal without a backbone |
| tissue | group of specialized cells |
| protostome | gastrula opening (blastophore) forms a mouth |
| vertebrate | animal with a backbone |
| carnivore | geeds on animals (meat) |
| pseudocoelomate | false body cavity |
| dorsal | upper surface, back |
| homeostasis | stable internal environment |
| cephalization | concentration of sense organs and nerve cells at front of body |
| zygote | fertilized egg, diploid cell formed by union of gametes |
| mesoderm | forms muscles and circulatory system |
| deuterostome | gastrula opening (blastophore) forms an anus |
| ectoderm | forms skin and nervous tissue |
| hermaphrodite | animals that produce sperm and eggs |
| posterior | back (rear) |
| acoelomate | no true body cavity |
| blastula | hollow ball of cells |
| sexual | reproduction that helps maintain genetic diversity |
| anterior | front (forward) |
| ectoderm | outer layer |
| herbivore | feeds on plants |
| endoderm | forms digestive tract |
| mesoderm | middle layer |
| endoderm | interior layer |
| filter feeder | filters food from water |
| ventral | lower surface, front |
