| A | B |
|---|
| Extinction | The last individual member of a species or population dies. |
| Ecosystem | All the different organisms living in a certain area along with the physical environment |
| Competition | Two or more species trying to use the same limited resource |
| Community | A group of interacting populations |
| Biotic factors | Living parts of an ecosystem |
| Abiotic factors | Non-living parts of an ecosystem |
| habitat | general place or physical environment in which a population lives |
| environmental science | the systematic study of all aspects of the environment and their interactions |
| niche | an organisms "occupation", or how it lives |
| nonrenewable resources | a resource, such as fossil fuels, that doesn't significantly regenerate itself on a human time scale |
| biosphere | the sphere or "layer" of living organisms on Earth |
| renewable resouces | a resource that will regenerate withing a human time scale; for example, crops and energy from the sun |
| predation | process in which certain organisms kill and consume other organisms |
| parasitism | occurs where one species lives off another species and may actively harm the host |
| mutualism | a form of symbiosis that benefits both species |
| commensalism | where one species benefits and the other is not affected |
| applied science | science put into practice |
| organism | a plant or animal |
| species | all of the organisms that can interbreed to produce fertile offspring |
| population | a group of individuals of the same species living in the same area |
| ecology | the study of how organisms interact with each other and their environment |
| pollution | to contaminate, as with harmful waste substances |
| hypothesis | an assumption used as a basis for investigation or argument |
| prey | an animal hunted or seized for food |
| host | a living organism, as an animal or plant, on or in which a parasite lives |
