| A | B |
|---|
| Niche | An organism’s particular role in an ecosystem, or how it makes its living. |
| Competition | The struggle between organisms for the limited resources in a habitat. |
| Predation | An interaction in which one organism hunts and kills another animal for food. |
| Predator | A carnivore that hunts and kills other animals for food and has adaptations that help it capture the animals it preys upon. |
| Prey | An animal that a predator feeds upon |
| Symbiosis | A close relationship between two organisms in which at least one of the organisms benefits. |
| Mutualism | A type of symbiosis in which both partners benefit from living together. |
| Commensalism | A relationship between two species in which one species benefits and the other is neither helped nor harmed. |
| Parasitism | A relationship in which one organism lives on or inside another and harms it. |
| Parasite | An organism that lives on or in a host and causes harm to the host. |
| Host | An organism that provides a source of energy or a suitable environment for a virus or for another organism to live. |
