| Term | Definition |
| producer | thing that make their own food |
| photosynthesis | harness solar energy |
| chemosynthesis | process by which some organisums, such as certain bacteria, use chemical energy to produce carbohydrates |
| heterotroph | organisms that rely on other organisms for their energy |
| herbivores | obtain energy by eating only plants |
| carnivor | obtain energy by eating meat |
| omnivores | eat both meat and plants |
| detritivores | obtain energy from eating animal and plant remains and other dead matter |
| decomposer | break down organic matter |
| food chain | steps in the food cycle |
| food web | feeding relationship amoung organisums |
| tropoc level | what the food chain and the food web are called |
| biomass | amount of living tissue |