| A | B |
|---|
| Ecosystem | Made up of organisms interacting with one another and their environment. |
| Community | Organisms that live together in an ecosystem. |
| Population | Organisms of the same kind in a community. |
| Adaptation | A structure or behavior that enables a species to survive and reproduce in its environment. |
| Niche | The role that each species plays in a community. |
| Producers | Organisms that "make" their own food, like plants, trees, vines, shrubs, ferns, and mosses. |
| Consumers | Organisms that obtain energy by eating other organisms. |
| Decomposers | Organisms that feed on wastes of living organisms and on dead, decaying plants and animals. |
| Herbivores | Plant-eating consumers. |
| Carnivores | Meat-eating consumers. |
| Omnivores | Consumers that eat both plants and animals. |
| Parasitism | A relationship in which one organism lives in or on, feeds upon, and harms another organism. |
| Commensalism | A relationship in which one species benefits, while the other species seems unaffected. |
| Mutualism | A relationship in which all species that take part benefit from it. |
