| A | B |
|---|
| ecosystem | an area where living and non-living things interact |
| food chain | a series of organisms feeding on each other |
| food web | several food chains interconnected |
| energy pyramid | a chart that shows the amount of energy available at each level of a food chain |
| water cycle | the circular flow of water through the environment |
| precipitation | rain, snow, sleet, hail |
| evaporation | to change from a liquid to a gas |
| condensation | to change from a gas to a liquid |
| nitrogen | an element needed by all living things |
| carbon dioxide | the gas plants need and animals give off |
| oxygen | the gas animals need and plants give off |
| consumer | an organism that gets its energy by eating other organisms |
| producer | an organism that gets its energy from its environment |
| decomposer | an organism that gets its energy by breaking down dead organisms |
| fungus | an example of a decomposer |
| tiger | an example of a consumer |
| horse | an example of a herbivore |
| tree | an example of a producer |
| snake | an example of a carnivore |
| human | an example of an omnivore |
