| A | B |
|---|
| consumers | organisms within a community which cannot make their own food and therefore depend on other organisms for their food |
| decomposer | an organism that obtains energy from dead organisms and waste material |
| food chain | simple model of feeding relationships in an ecosystem |
| food web | model of all possible feeding relationships in an ecosystem |
| herbivores | animals which eat only producers |
| producers | organisms which make food by the process of photosynthesis |
| carnivore | consumer that eats only animals |
| energy pyramid | compares energy available at each level of the food chain |
| biotic factors | living (or previously living) things in the environment |
| abiotic factors | nonliving things in the environment |
| omnivore | consumers that eat both plants and animals |
| chemosynthesis | production of food without sunlight |
| latitude | distance from the equator |
| atmosphere | air that surrounds the Earth |
| wind | air currents |
| fixation | bacteria from the nitrogen compounds that plants need |
| climate | average weather conditions over time |
| elevation | distance above sea level |
| soil | topmost layer of the Earth's crust |
| liquid water changes into water vapor | evaporation |
| water vapor changes into liquid water | condensation |
