| A | B |
|---|
| 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 |
| abiotic factor | a nonliving part of an organism's habitat |
| species | a group of similar organisms that can mate with each other to produce offspring that can also mate and reproduce |
| population | all of the members of one species living in the same area |
| community | all of the different populations that live together in a particular area |
| ecosystem | the community or organisms that live in a particular area, along with their nonliving environment |
| ecology | the study of how organisms interact with each other and their environment |
| birth rate | the number of births per 1000 individuals for a certain time period |
| death rate | the number of deaths per 1000 individuals for a certain time period |
| immigration | movement of individuals into a population's area |
| emigration | movement of individuals out of a population's area |
| population density | the number of individuals in an area of a specific size |
| limiting factor | an environmental factor that causes a population to decrease in size |
| carrying capacity | the largest population that a particular environment can support |
