| A | B |
| monerans | simple, one-celled organisms |
| protists | more complex cell structure than monerans |
| fungi | many celled, cannot make their own food, cannot move |
| plants | many celled organisms that make their own food |
| animals | many celled organisms that eat food |
| spores | special cells fungi use to reproduce |
| nucleus | the control center of a cell |
| kingdom | broadest category of organisms |
| species | smallest category of organisms |
| Aristotle | first to classify organisms by where they live |