| Description | Level |
| Everything? | |
| All living and nonliving things in one area? | |
| All living things in one area? | |
| All of one type of living thing in an area? | |
| One living thing? | |
| A group of parts of complex organisms working together? | |
| Part of a complex organism? | |
| Pieces of an organ? | |
| | Description | Level |
| Smallest unit of life? | |
| One part of a complex cell? | |
| Huge building blocks for cells? | |
| Small non living units? | |
| Smallest unit of matter? | |
| Pieces of atoms? | |
| Parts of the pieces of matter? | |
|