| Term | Definition |
|---|
| niche | the role or 'job' of an organism in an ecosystem |
| habitat | the place where an organism lives |
| predator-prey relationship | a relationship where one organism kills the other for food |
| parasitism | a relationship where one organism benefits from the relationship and the other organism is harmed |
| host | an animal or plant that supports a parasite |
| commensalism | a relationship in which one organism benefits and the other is not harmed |
| mutualism | a relationship in which both species benefit |
| producer | an organism that makes its own food. A plant. |
| herbivore | any animal that feeds on plants |
| carnivore | any animal that feeds on other animals |
| omnivore | an animal that feeds on both animal and plants |
| scavenger | animal that eats only dead organisms |
| food chain | series of steps in which organisms transfer energy by eating and being eaten |
| food web | A group of overlapping food chains |
| decomposers | organisms that break down wastes and dead organisms and return raw materials to the environment |
| energy pyramid | A diagram showing how energy moves through a food chain |
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