| A | B |
|---|
| ecosystem | all living and nonliving things that interact in an area. |
| habitat | place where an organism lives and provides the things the organism needs. |
| biotic factor | living parts of an ecosystem. |
| abiotic factor | nonliving parts of an ecosystem |
| population | all the members of one species in an area. |
| society | closely related population of animals that work together. |
| community | all the different populations that live together in an area. |
| ecology | the study of how things interact with one another and with their environment. |
| producers | organisms that make their own food and store energy. |
| consumers | organisms that cannot make their own food and obtain energy by eating other organisms. |
| food chain | a diagram used by ecologists to show the flow of energy from organism to organism. |
| food web | a diagram that shows how many food chains are connected. |
| biomass | the total amount of living matter, and the remains of dead organisms, in an area. |
| decomposers | obtain energy by breaking down wastes and the remains of dead organisms. |
