Terms : Hide Images
| 7240631808 | conservation | allowing the use of resources in a responsible manner | 0 | |
| 7240632725 | preservation | setting aside areas and protecting them from human activities | 1 | |
| 7240659535 | keystone species | species whose role in an ecosystem are more important than others (sea otters, sea stars, grizzly bears, prairie dogs) | 2 | |
| 7240662666 | indicator species | species that serve as early warnings that an ecosystem is being damaged EX: trout | 3 | |
| 7240665728 | characteristics of endangered species | small range, large territory, or live on an island | 4 | |
| 7240668266 | endangered species | a group of organisms in danger of becoming extinct if the situation is not improved; population numbers have dropped below the critical number of organisms EX: north spotted owl, bald eagle, piping plover | 5 | |
| 7240678828 | invasive/alien/exotic species | non-native species to an area; often thrive and disrupt the ecosystem balance EX: kudzu vine, water hyacinth, fire ant | 6 | |
| 7241939461 | parts of the hydrologic cycle | evaporation, transpiration, runoff, condensation, precipitation, infiltration | 7 | |
| 7241943011 | nitrogen fixing | because atmospheric N2 can't be used directly by plants, it must first be converted into ammonia (NH3) by bacteria (rhizobium or cyanobacteria) | 8 | |
| 7241953074 | ammonification | nitrogen is converted into ammonia by ammonifying bacteria; may occur when nitrogen in organic wastes in the soil are converted to ammonia or when atmospheric nitrogen (N2) is converted to NH3 | 9 | |
| 7241961762 | nitrification | ammonia (NH3) is converted to nitrate ions (NO3)- | 10 | |
| 7241964447 | assimilation | inorganic N2 is converted into organic molecules such as DNA/amino acids & proteins- plants assimilate nitrogen as NH4+ or NO3- through their roots; animals (herbivores) assimilate organic nitrogen compounds by eating plants | 11 | |
| 7241974839 | denitrification | bacteria convert nitrate (NO3)- and nitrite (NO2)- back into N2 gas; bacteria convert ammonia (NH3) back into N2 or N2O- typically accomplished by anaerobic bacteria | 12 | |
| 7241989423 | Phosphorus does not circulate as easily as nitrogen because: | it does not exist as a gas, but is released by weathering of phosphate (PO4)3- rocks; this is a sedimentary cycle- it is never found as a gas | 13 | |
| 7242001485 | How excess phosphorus is added to aquatic ecosystems: | runoff of animal wastes, fertilizer, discharge of sewage; limiting factor in freshwater ecosystems; excess P leads to eutrophication | 14 | |
| 7242008750 | photosynthesis | plants convert atmospheric carbon (CO2) into complex carbohydrates (glucose C6H12O6); energy is consumed and oxygen is released as a waste product | 15 | |
| 7242029824 | aerobic respiration | O2-consuming producers, consumers, and decomposers break down complex organic compounds & convert C back into CO2; energy is released and oxygen is consumed in the process | 16 | |
| 7242041046 | anaerobic respiration | break down of carbohydrates without oxygen- products are methane (CH4), alcohols, and other organics | 17 | |
| 7242048298 | transpiration | process where water is absorbed by plant roots, moves up through plants, passes through pores (stomata) in leaves or other parts, evaporates into atmosphere as water vapor | 18 | |
| 7242056240 | largest reservoirs of C: | carbonate (CO3)2- rocks first, oceans second | 19 |
