| A | B |
|---|
| atoms | the smallest units of an element. Has a nucleus made of protons, neutrons, and electrons |
| molecules | combinations of atoms that bond (or stick) together to make other things |
| organelles | the cell's insides that do certain jobs for the cell to survive |
| cells | basic unit of life. Shows the 7 characteristics of life |
| tissues | lots of cells working together to create structures and do other jobs for complex organisms |
| organs | groups of tissues working together that do certain jobs that help the cells or whole organisms |
| systems | groups of organs working together to do certain jobs for multicellular organisms |
| complex multicellular organisms | plants and animals - showing 7 characteristics of life |
