| A | B |
|---|
| ecosystem | all the living and nonliving things that interact in an area |
| biotic factors | the living parts of an ecosystem |
| abiotic factors | the nonliving parts of an ecosystem |
| species | a group of organisms that are physically similar and can reproduce with each other to produce fertile offspring |
| population | all the members of one species in a particular area |
| community | all the different populations that live together in an area |
| limiting factor | an environmental factor that prevents a population from increasing |
| carrying capacity | the largest population that an environment can support |
| adaptations | the behaviors and physical characteristics of species that allow them to live successfully in their environment |
| competition | the struggle between organisms to survive in a habitat 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 |
| 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 | a relationship in which one organism lives on or inside another and harms it |
