| A | B |
|---|
| virus | a tiny particle that can reproduce only inside the cells of living things |
| bacteria | tiny one celled organisms, some of which can cause diseases |
| cell | the basic unit of a living organism |
| cell membrane | a thin layer that makes up the outside of the cell and controls what enters and leaves it |
| nucleus | the cell part that controls the activities |
| cytoplasm | jellylike material that fills most of a cell |
| cell wall | a stiff outer layer that helps keep plant cells firm |
| chloroplast | the green cell part in plant cells that traps and uses light energy |
| tissue | groups of similar cells |
| organ | tissues that work together |
| systems | organs that work together |
| kingdom | the largest group into which an organism is classified |
| genus | a group of closely related species |
| species | a group of organisms that have the same traits and can be interbred in nature |
| moneran | one-celled organisms with no separate nucleus |
| protist | one-celled organisms with a nucleus and other cell structures |
| fungus | many-celled organisms that cannot move and absorb nutrients from others |
| plant | many-celled organism that cannot move and uses energy from the sun to make food |
| animal | many-celled, most can move, get energy from consuming other organisms |
| classify | to arrange in groups using a system |
