| A | B |
|---|
| producer | an organism that can make its own food |
| consumer | an organism that obtains energy by feeding on other organisms |
| decomposer | organisms that break down wastes and dead organisms and return the raw materials to the environment |
| food chain | a series of events in which one organism eats another and obtains energy |
| evaporation | the process by which molecules of liquid water absorb energy and change to the gas state |
| condensation | the process by which a gas changes to a liquid |
| succession | the series of predictable changes that occur in a community over time |
| pioneer species | the first species to populate an area |
| nitrogen fixation | the process of changing free nitrogen gas into a usable form of nitrogen |
| scavenger | a carnivore that feeds on the bodies of dead organisms |
