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| 4090963427 | Decomposes faster in tropical rain forests than in temperate forests | Organic Material | 0 | |
| 4090966237 | Equal to gross primary production minus energy for respiration | Net primary production | 1 | |
| 4090968273 | Cannot be recycled, so an ecosystem must have a continuous influx of energy | Energy | 2 | |
| 4090970016 | The amount of light energy that is converted to chemical energy by photosynthesis | Gross primary production | 3 | |
| 4090972624 | Consumers that get their energy from nonliving organic material such as remains of dead organisms, feces, fallen leaves, and wood | Detritivores | 4 | |
| 4090974265 | Energy cannot be created or destroyed | Law of Conservation of Energy | 5 | |
| 4090975171 | Carnivores that eat herbivores | Secondary Consumers | 6 | |
| 4090981041 | Herbivores consume relatively little plant biomass because they are held in check by limiting resources, predators, parasites, and other forces | Green World Hypothesis | 7 | |
| 4090982545 | Occurs in lakes polluted by excess amounts of nutrients | Eutrophication | 8 | |
| 4090982553 | Carnivores that eat carnivores | Tertiary Consumers | 9 | |
| 4090985319 | Increases the amount of precipitation in a region and amount of solar energy available | Actual Evapotranspiration | 10 | |
| 4090987737 | Consists of the community plus the abiotic factors. Characterized by energy flow and chemical cycling | Ecosystem | 11 | |
| 4090988631 | This trophic level consists of herbivores | Primary Consumers | 12 | |
| 4090989715 | This trophic level consists of autotrophs | Primary Producers | 13 | |
| 4090990723 | Toxins become more concentrated in successive trophic levels of the food web | Biological Magnification | 14 | |
| 4172445340 | The amount of light energy converted to chemical energy by autotrophs during a given time period | Primary production | 15 | |
| 4172468389 | NPP is only available to | Consumers | 16 | |
| 4172480715 | The element that must be added for production to increase in an area | Limiting nutrient | 17 | |
| 4172485193 | Sewage runoff can cause _________ of lakes | Eutrophication | 18 | |
| 4172584700 | Evapotranspiration is affected by | precipitation, temperature, and solar energy | 19 | |
| 4172592297 | The amount of chemical energy in food converted to new biomass during a given period of time | Secondary production | 20 | |
| 4172596937 | The fraction of energy stored in food that is not used for respiration | Production efficiency | 21 | |
| 4172600322 | The percentage of production transferred from one trophic level to the next | Trophic efficiency | 22 | |
| 4172614690 | Trophic efficiency is usually about ___, with a range of ___ to ____ | 10%; 5%; 20% | 23 | |
| 4172622772 | Nutrient cycles in ecosystems involve biotic and abiotic components and are often called | Biogeochemical cycles | 24 | |
| 4172647669 | Four factors of studying cycling of water, carbon, nitrogen, and phosphorus | Each chemical's biological importance, forms in which each chemical is available or used by organisms, major reservoirs for each chemical , key processes driving movement of each chemical through its cycle | 25 | |
| 4172661065 | Photosynthetic organisms convert CO2 to __________ that are used by heterotrophs | Organic molecules | 26 | |
| 4172666497 | A major constituent of nucleic acids, phospholipids, and ATP | Phosphorus | 27 | |
| 4172669442 | A component of amino acids, and nucleic acids | Nitrogen | 28 | |
| 4172670812 | Main reservoir of nitrogen | The atmosphere | 29 |
