| A | B |
|---|
| Ecosystem | All living and nonliving things that interact in an area |
| Habitat | Place where an organism lives that provides what it needs |
| Ecology | Study of how living things interact |
| Biotic Factor | A living part of the ecosystem |
| Abiotic Factor | A nonliving part of the ecosystem |
| Population | All members of one species in particular area |
| Community | All the different populations that live together in an area |
| Carrying capacity | The largest population that an area can support |
| Limiting factor | An environmental factor that prevents a population from increasing |
| Niche | An organism's articular role in an ecosystem |
| Competition | The struggle between organisms for limited resources in a habitat |
| Predation | An interaction in which one organism hunts and kills another for food |
| Predator | A carnivore that hunts and kills other animals for food |
| Prey | An animal that a predator feeds upon |
| Symbiosis | A close relationship between two organisms in which at least one benefits |
| Mutualism | A type of symbiosis in which both organisms benefit |
| Commensalism | A relationship in which one benefits and one is neither helped nor harmed |
| Parasitism | A relationship in which an organism lives on or inside another and harms it |
| Parasite | An organism that lives on or in a host and causes harm |
| Host | An organism that provides a environment for another organism to live |
