| A | B |
|---|
| ecosystem | a community of living and non-living things that work together |
| community | collections of plant or animal organisms sharing an environment |
| population | people or organisms of a particular species living in a given geographic area |
| habitat | the place where a particular species lives and grows |
| producer | green plants that make their own food |
| consumer | animals that eat producers |
| food chain | the feeding relationships between species in an ecological community |
| decomposer | plants and animals that break down dead plants and animals into organic materials |
| food web | show how plants and animals are connected in many ways to help them all survive |
| energy pyramid | Flow of energy through a food chain |
| carbon dioxide cycle | plants absorb carbon dioxide from the atmosphere and use it |
| oxygen cycle | the biogeochemical cycle that describes the movement of oxygen within and between its three main reservoirs: the atmosphere, the biosphere, and the lithosphere |
| predator | an animal that lives by killing and eating other animals |
| prey | an animal hunted or killed by another animal for food |
| scavenger | an organism that feeds on dead or decaying matter |
| parasite | a living thing which lives in or on another living thing |
| host | a living animal or plant on or in which a parasite lives |
