| A | B |
|---|
| ecosystem | all the living & nonliving things that interact in a particular area |
| habitat | the place where the organism lives & provides the things it needs to survive |
| biotic factors | the living parts of the ecosystem |
| abiotic factors | the nonliving parts of the ecosystem |
| species | a group of organisms that are physically similar and reproduce |
| population | all the members of one species in a particular area |
| community | all the different populations that live together in an area |
| population density | the number of individuals in a specific area |
| immigration | moving into a population |
| emigration | leaving a population |
| limiting factor | an environmental factor that prevents a population from increasing |
| adaptations | the behaviors and characteristics of species that allow them to live successfully in their environment |
| competition | the struggle between organisms to survive in an environment with limited resources |
| predation | an interaction in which one organism kills and eats another |
| symbiosis | a close relationship between two species that benefits at least one of the species |
| predator | the organism that does the killing |
| prey | the organism that is killed |
| mutualism | a relationship in which both species benefit |
| commensalism | a relationship in which one species benefits and the other species is neither helped nor harmed |
| parasitism | relationship involving one organism living on or inside another organism and harming it |
