| Term | Definition |
|---|
| carbon | an abundant element that combines with oxygen and hydrogen to form the organic compounds that make up organisms. |
| carbon cycle | the flow of carbon in the form of carbon dioxide molecules between the earth's surface and atmosphere. |
| consumers | organisms, primarily animals, that get their food from producers. They feed on green plants or on other animals that eat plants. |
| decomposers | a specific type of consumer that feeds on dead plant or animal matter. Examples are bacteria and fungi. |
| fossil fuels | the carbon-rich matter from plants and animals that has been trapped in the earth's crust and can be burned to release energy. Examples are coal, gas, and oil. |
| greenhouse effect | the trapping of reflected heat from the sun by the earth's atmosphere, especially carbon dioxide. An increase in the amount of carbon dioxide may result in a warming of the earth. |
| photosynthesis | the food-making process of the natural world |
| producers | green plants that produce food by photosynthesis. |
| respiration | the breakdown of food with the release of energy and carbon dioxide. it takes place in all living things. |
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