| A | B |
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| niche | an organism's role in an ecosystem, which includes everything the organism does and everything the organism needs in its environment |
| competition | the type of interaction in which organisms struggle with one another to obtain resources |
| predator | an organism that kills and eats another organism |
| prey | an organism that is eaten by the predator |
| symbiosis | a close relationship between two organisms in which one organism lives near, on, or even inside another organism and in which at least one organism benefits |
| commensalism | a form of symbiosis in which one organism benefits and the other is not harmed |
| mutualism | a form of symbiosis in which both organisms benefit |
| parasitism | a form of symbiosis in which one organism benefits and the other is harmed |
| parasite | an organism that lives on or inside the body of a host organism and harms the host |
| host | an organism that provides a home for another organism |
