| A | B |
|---|
| Invertebrates | animals without backbones |
| Classification | organizing animals into groups according to specific characteristics |
| Bilateral Symmetry | animals that have two similar halves |
| Radial Symmetry | Animals that grow in all directions from a central point |
| Exoskeleton | animals covered by a hard skeleton on the outside of the body |
| Endoskeleton | a hard skeleton inside an animal's body |
| Asymmetric | no symmetry |
| Regenerate | ability for parts of an animal to grow back over time |
| sessile | do not move |
| Polyps | vase shaped body form, sessile |
| Medusas | umbrella shaped body form, free swimming |
| Visceral mass | contains organs and mantle on a mollusk |
| Bivalves | two shells attached to each other |
| Gastropods | a mollusk with one shell |
| Cephalopods | Mollusks with big heads and arms or tentacles |
| Segmented body | includes head, thorax, and abdomen |
