| Term | Definition |
| Food Chain | The Sequence of who eats whom in a biological community |
| Food Web | The network of all the inter-related food chains in a biological community |
| Autotroph | An organism that makes its food from light or chemical energy without eating |
| Heterotroph | An organism that gets its energy by eating other organisms |
| Carnivore | An organism that eats meat |
| Herbivore | An organism that eats plants |
| Primary Consumer | A meat-eater that eats autotrophs |
| Secondary Consumer | A meat-eater that eats primary consumers |
| Tertiary Consumer | A meat-eater that eats secondary consumers |
| Quaternary Consumer | A meat-eater that eats tertiary consumers |
| Omnivore | an animal that eats both plants and animals |
| Nutrients | Substance animals need to survive |
| Producer | Animal that makes its own food |
| Ecosystem | Interacting group of organisms |
| Detrivore | An organism that eats decaying matter |
| Prey | Animal eaten by a predator |
| Diet | What an animal eats |
| Decomposer | An organism that breaks down organic matter |
| Organism | Living Thing |
| Consumer | Eats other organisms |