| Term | Definition |
|---|
| organism | a living thing |
| habitat | an environment that provides the things the organism needs to live, grow, and reproduce |
| biotic factor | the living parts of a habitat |
| abiotic factor | the nonliving parts of a habitat |
| photosynthesis | a process taking water, carbon dioxide, and sunlight then turning it into energy (glucose) and oxygen |
| species | a group of organisms that are physically similar and can mate with each other and produce offspring that can also mate and reproduce |
| population | all the members of one species in a particular area |
| community | all the different populations that live together in an area |
| ecosystem | the community of organisms that live in a particular area, along with their nonliving surroundings |
| ecology | the study of how living things interact with each other and with their environment |
| natural selection | when individuals whose unique characteristics are best suted for their environment survive and produce offspring |
| adaptations | the begaviors and physical characteristics that allow organisms to live successfully in their environments |
| niche | the role of an organism in its habitat |
| competition | the struggle between organisms to survive as they attempt to use the same limited resource |
| predation | an interaction in which one organism kills another for food |
| predator | an organism that kills in predation |
| prey | an organism that is killed in predation |
| 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 | an interaction involving one organism living on or inside another organism and harming it |
| parasite | the organism that benefits from parasitism |
| host | the organism that a parasite lives in or on in parasitism |
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