| A | B |
|---|
| Autotroph | Organism that gets energy from sun |
| Heterotroph | Organism that gets energy from food |
| Carnivore | Organism that gets energy from eating other animals |
| Herbivore | Organism that gets energy from eating plants |
| Omnivore | Organism that gets energy from eating plants and animals |
| Decomposer | Organism that breaks down and obtains energy from dead organic matter |
| Parasitism | Symbiosis: +- |
| Mutualism | Symbiosis: ++ |
| Commensalism | Symbiosis: +0 |
| Ecosystem | Communities of organisms, along with nonliving environment |
| Habitat | Area where an organism lives |
| Niche | An organism's "job"; "how it makes a living" |
| Communities | Different populations in the same area |
| Population | Groups of animals of the same species in one area |
| Ecology | Study of organism interactions and environment |
| Food Chain | Steps where energy is transferred between organisms |
| Food Web | Complex network of energy transfer; many food chains |
