| A | B |
| herbivore | eats only plants |
| carnivore | eats only animals |
| omnivore | eats both plants & animals |
| consumer | eats other organisms |
| producer | makes its own energy |
| food web | includes complex feeding relationships |
| food chain | includes 1 simple feeding relationship |
| population | same species in 1 area |
| community | the various species in 1 area |
| ecosystem | all living and nonliving things in 1 area |
| biome | regional or global ecosystems |
| detritivore | eats dead organic matter |
| decomposer | returns organic material back to the environment |
| biodiversity | the variety of living things in an ecosystem |
| generalist | eats many types of food |
| specialist | eats one or very few types of food |
| biotic | living things in an ecosystem |
| abiotic | nonliving things in an ecosystem |
| keystone species | a species very important to its ecosystem |
| ecology | the study of interactions among living things & their surroundings |