Terms : Hide Images
| 6318832956 | trophic levels | each of several hierarchical levels in an ecosystem, comprising organisms that share the same function in the food chain and the same nutritional relationship to the primary sources of energy | 0 | |
| 6318832957 | photosynthetic autotrophs | Organisms that use light for the energy to synthesize organic compounds | 1 | |
| 6318832958 | primary producers | organisms in an ecosystem that produce biomass from inorganic compounds | 2 | |
| 6318832959 | primary consumers | organisms that eat the autotrophs | 3 | |
| 6318832960 | secondary consumers | eat primary consumers | 4 | |
| 6318832961 | tertiary consumers | a carnivore at the topmost level in a food chain that feeds on other carnivores | 5 | |
| 6318832962 | turnover time | Measure of the movement of an element in a biogeochemical cycle | 6 | |
| 6318832963 | production efficiency | Measure of the amount of biomass stored by consumers relative to the amount of food they successfully absorbed | 7 | |
| 6318832964 | trophic efficiency | describes the efficiency with which energy is transferred from one trophic level to the next | 8 | |
| 6318832965 | evapotransipiration | sum of evaporation and plant transpiration from the Earth's land and ocean surface to the atmosphere | 9 | |
| 6318832966 | chemoautotroph | an organism that uses inorganic energy sources for food. Then it puts together its own organic compounds using ATP | 10 | |
| 6318832967 | gross primary production | the amount of chemical energy as biomass that primary producers create in a given length of time | 11 | |
| 6318832968 | net primary production | the rate at which plants incorporate atmospheric carbon through photosynthesis | 12 | |
| 6318832969 | biomass | biological material derived from living, or recently living organisms | 13 | |
| 6318832970 | eutrophication | the enrichment of an ecosystem with chemical nutrients, typically compounds containing nitrogen, phosphorus, or both | 14 | |
| 6318832971 | detritivores | an organism that feeds on dead and decomposing organic matter | 15 | |
| 6318832972 | nitrogen fixation | is a process in which nitrogen (N2) in the atmosphere is converted into ammonium (NH4+) or nitrogen dioxide (NO. 2) | 16 | |
| 6318832973 | nitrification | the biological oxidation of ammonia or ammonium to nitrite followed by the oxidation of the nitrite to nitrate | 17 | |
| 6318832974 | dentrification | microbially facilitated process of nitrate reduction (performed by a large group of heterotrophic facultative anaerobic bacteria) that may ultimately produce molecular nitrogen (N2) through a series of intermediate gaseous nitrogen oxide products | 18 | |
| 6318832975 | carbon cycle | the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth |  | 19 |
| 6318832976 | nitrogen cycle | the process by which nitrogen is converted between its various chemical forms |  | 20 |
| 6318832977 | water cycle | also known as the hydrologic cycle or the H2O cycle, describes the continuous movement of water on, above and below the surface of the Earth |  | 21 |
| 6318832978 | biological magnification | often refers to the process whereby certain substances such as pesticides or heavy metals move up the food chain, work their way into rivers or lakes, and are eaten by aquatic organisms such as fish, which in turn are eaten by large birds, animals or humans | 22 | |
| 6318832979 | greenhouse effect | a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases, and is re-radiated in all directions | 23 | |
| 6318832980 | law of conservation of mass | that mass can neither be created nor destroyed, although it may be rearranged in space, or the entities associated with it may be changed in form, as for example when light or physical work is transformed into particles that contribute the same mass to the system as the light or work had contributed | 24 | |
| 6318832981 | acid precipitation | rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions (low pH) | 25 |
