| A | B |
|---|
| producer | organism that makes its own food |
| consumer | obtains energy by feeding on other organisms |
| herbivores | consumers that eat only plants |
| carnivores | consumers that eat only other animals |
| omnivores | consumers that eat both plants and animals |
| scavenger | carnivore that feeds on the bodies of dead organisms |
| decomposer | organisms that break down wastes and dead organisms and return the raw materials to the environment |
| food chain | series of events in which one organism eats another and obtains energy |
| food web | consists of the many overlapping food chains in an ecosystem. |
| energy pyramid | shows the amount of energy that moves from one feeding level to another in the food web. |
| water cycle | processes of evaporation, condensation, and precipitation |
| evaporation | process by which water molecules absorb energy and change to the gas state |
| condensation | process by which a gas changes to a liquid |
| precipitaion | rain, snow, sleet, or hail |
| nitrogen fixation | process of changing free nitrogen gas into a usuable form of nitrogen |
| nodules | bumps on the roots of certain plants that house nitrogen-fixing bacteria |
| biogeography | the study of where organisms live |
| dispersal | movement of organisms form one place ot another |
| native species | species that have evolved in an area |
| exotic species | organisms who have been brought into an area |
| biome | group of ecosystems with similar climates and organisms |
