| A | B |
|---|
| autotrophs | use sun for energy |
| producer | can produce food |
| photosynthesis | use light energy to power chemical reaction |
| chemosynthesie | use chemicalenergy to produce carbohydrates |
| heterotruphs | obtains energy from the foods it consumes |
| cunsumer | relies on other organisms for its energy and food supply |
| herbivore | obtains energy by eating only plants |
| omnivore | obtains energy by eating both plants and animals |
| detritivore | feeds on plant and animal remains and other dead matter |
| decomposer | breaks down and obtains energy from dead organic matter |
| food chain | deries of steps in an ecosystem in which organisms transfer energy by eating and being eaten |
| food web | network of complex interactions formed by the feeding relationships among the various organisms in an ecosystem |
| trophic level | step in a food chain or food web |
| ecological pyramid | diagram that shows the relative amounts of energy |
| biomass | total amount of living tissue within a given trophic level |
| evaporation | process by which water changes from a liquid into an atmospheric gas |
| transpiration | water leaves plant |
| nutrient | chemical substance that an organism requires to live |
| nitrogent fixation | process of converting nitrogen has into ammonia |
| primary productivity | rate at which organic matter is created by producers in an ecosystem |
