| A | B |
|---|
| habitat | The place where an organism lives and that provides the things the organism needs |
| biotic factors | The living parts of an ecosystem |
| ecosystem | All the living and non living things that interact in a particular area |
| abiotic factors | The non living parts of an ecosystem |
| population | All the members of one species in a particular area |
| community | All the different populations that live together |
| ecology | The study of how living things interact with one another and with the environment |
| estimate | An approximation of a number based on a reasonable assumption |
| birthrate | The number of births in a population in a certain amount of time |
| deathrate | The number of deaths in a population in a certain amount of time |
| Immigration | Moving into a population |
| Emigration | Means leaving a population |
| limiting factor | An environmental factor that prevents a population from increasing |
| carrying capacity | The largest population that an environment can support |
| niche | An organisms particular role or how it makes its living |
| competition | The struggle between organisms to survive in a habitat with limited resources |
| predation | An interaction in which one organism hunts and kills another for food |
| prey | The organism that is caught |
| predator | The organism that kills the prey |
| symbiosis | A close relationship between two species that benefits at least one species |
| commensalism | A relationship in which one species benefits and the other species is neither helped nor harmed |
| parasitism | One organism living on or inside another organism and harming it |
| parasite | The organism that benefits from parasitism |
| host | The organism the parasite lives on or in |
