| A | B |
|---|
| Biosphere | Includes environments support life (soil |
| Ecosystem | All organisms (living things) and nonliving components of the environment (water |
| Community | All living organisms in a particular area. |
| Population | Same species interacting which each other. |
| Organism | A living thing. |
| Organ system | A group of organs working together to perform a vital body function. |
| Organ | A structure consisting of several different tissues to perform a specific function. |
| Tissue | Group of same cells. |
| Cell | Basic unit of structure and function. The basic unit of all living things. |
| Organelle | A specialized structure within a cell that performs specific cellular functions. |
| Macromolecule | Very large molecules composed of many many many smaller molecules. |
| Polymer | Many single units joined together |
| Monomer | Single unit; building blocks of larger molecules |
| Molecule | Group of 2 or more atoms held together by covalent bonds. |
| Element | A substance composed of only 1 type of atom. |
| Atom | Smallest unit of matter. |
