| A | B |
|---|
| natural selection | a characteristic that makes an individual better suited to a specific environment through a process |
| niche | the role of an organism in its habitat |
| adaptation | the behaviors and physical characteristics that allow organisms to live successfully in their environments |
| competition | the struggle between organisms to survive as they attempt to use the same limited resources |
| predation | an interaction in which one organism kills another for food or nutrients |
| predator | the organism that does the killing |
| prey | the organism that is killed |
| symbiosis | any relationship in which two two species live closely together and at least one of the species benefits |
| mutualism | a relationaship in which both species benefit |
| commensalism | a relationship in which one species benefits and the other species is neither helped nor harmed |
| parasitism | a relationship that involves one organism living with, on, or inside another organism and harming it |
| parasite | the organism that beneifts from the parasitism |
| host | the organism a parasite lives on or in |
| succession | the series of predictable changes that occur in a community over time |
| primary succession | the series of changes that occur in an area where no soil or organisms exist |
| pioneer species | the first species to populate an area |
| secondary succession | the series of changes that occur in an area where the ecosystem has been disturbed, but where soil and organisms still exist |
