| Word | Meaning |
| Classification | The process of dividing living things into ordered groups by their shared and unshared qualities |
| Kingdom | The largest group made in classification |
| Autotroph | A living thing that makes its own food |
| Heterotroph | A living thing that eats food made by another |
| Prokaryotic cell | A cell with no clearly formed nucleus |
| Eukaryotic cell | A cell with a clearly formed nucleus |
| Unicellular | A body made of a single cell |
| Multicellular | A body made of many cells together |
| Producer | A living thing that makes food by photosynthesis |
| Consumer | A living thing that eats food made by others |
| Decomposer | A living thing that feeds by rotting down dead matter |
| Evolution | The order in which living things have changed from undeveloped to developed |
| Lichen | A fungus and an alga living together as one body |