| A | B |
|---|
| natural selection | the process by which organisms that are best adapted to their environment are most likely to survive and reproduce |
| adaptation | an inherited behavior or physical characteristic that helps an organism survive and reproduce in its environment |
| niche | how an organism makes its living and interacts with abiotic and biotic factors in its habitat |
| competition | the struggle between organisms to survive as they attempt to use the same limited resources in the same place at the same time |
| predation | an interaction in which one organism kills another for food or nutrients |
| predator | the organism that does the killing in a predation interaction |
| prey | an organism that is killed and eaten by another organism in a predation interaction |
| symbiosis | any relationship in which two species live closely together and that benefits at least one of the species |
| mutualism | a type of symbiosis in which both species benefit from living together |
| commensalism | a type of symbiosis between two species in which one species benefits and the other species is neither helped nor harmed |
| parasitism | a type of symbiosis in which one organism lives with, on, or in a host and harms it |
| parasite | the organism that benefits by living with, on, or in a host in a parasitism interaction |
| host | an organism that a parasite lives with, in, or on, and provides a source of energy or a suitable environment for the parasite to live |
