| A | B |
|---|
| symbiosis | a close relationship between two organisms in which at least one of the organisms benefits |
| mutualism | a type of symbiosis in which both partners benefit from living together |
| commensalism | a relationship between two species in which one species benefits and the other is neither helped nor harmed |
| parasitism | a relationship in which one organism lives on or inside of another and harms it |
| immigration | moving into a population |
| emigration | leaving a population |
| predation | an interaction in which one organism hunts and kills another animal for food |
| birthrate | the number of births in a population in a certain amount of time |
