| Term | Definition |
| binomial nomenclature | two-part naming system |
| bilateral symmetry | body plan with two-sided sameness |
| fusiform | a narrow-wide-narrow aerodynamic/hydrodynamic shape |
| cephalization | the adaptive arrangement of sensory organs at the anterior end |
| heterotrophic | other nourishing |
| dioecious | have two houses in gender morphology and physiology |
| eukaryotic | cells with membrane bound nucleus |
| semipermeable | nature of all cell membranes; let some stuff through but keep other stuff out |
| diffuse | movement of molecules via thermal or molecular motion |
| osmose | the passing of fluids |
| homology | evolutionary based similarity of structures and functions between vertebrate organisms |