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Environment
| organism | a living thing |
| habitat | an environment that provides the things a specific organism needs to live, grow, and reproduce |
| biotic factor | A living or once living part of an organism's habitat |
| abotic factor | a nonliving part of an organism's habitat |
| species | A group of similar organisms that can mate with each other and produce offspring that can also mate and reproduce |
| population | All the members of one species living in the same area |
| community | All the different populations that live together in particular area |
| ecosystem | The community of organisms that live in a particular area, along with their nonliving enviroment |
| ecology | The study of how organisms interact with each other and their environment |