| A | B |
|---|
| gills | organs that allow aquatic animals to absorb oxygen from the water |
| fin | a fan shaped structure that helps a fish move, steer, and stop |
| cartilage | flexible, bonelike skeletal material |
| endotherm | an animal that generates body heat inside its body |
| invertebrate | an animal without a backbone |
| radial symmetry | a body form in which the parts are arranged in a circle |
| bilateral symmetry | a body form in which there are two similar halves |
| exoskeletona | a skeleton on the outside of an animals body |
| taproot | one main root that grows downward |
| fibrous root | a root composed of several equal-sided roots that spread out from the plants base |
