Terms : Hide Images
| 31242868 | abiotic | nonliving, physical features of the environment, including air, water, sunlight, soil, temperature, and climate | 0 | |
| 31242869 | aerobic respiration | energy releasing biochemical reactions that use oxygen. | 1 | |
| 31242870 | anaerobic respiration | Respiration in the absence of oxygen. This produces lactic acid. | 2 | |
| 31242871 | aquatic life zones | Marine and freshwater portions of the biosphere. | 3 | |
| 31243992 | atmosphere | the envelope of gases surrounding any celestial body | 4 | |
| 31243993 | autotrophs | organisms that use energy from sunlight or from chemical bonds in inorganic substances to make organic compounds | 5 | |
| 31243994 | biological community | All of the populations of organisms living and interacting in a particular area | 6 | |
| 31243995 | biomass | organic matter that contains stored energy | 7 | |
| 31243996 | biomes | a community of living organisms of a single major ecological region | 8 | |
| 31243997 | biosphere | part of Earth in which life exists including land, water, and air or atmosphere | 9 | |
| 31243998 | biotic | Pertaining to life; environmental factors created by living organisms | 10 | |
| 31243999 | carbon cycle | the circulation and reutilization of carbon atoms especially via the process of photosynthesis and respiration. | 11 | |
| 31244000 | carnivores | Organisms that eat other animals for energy | 12 | |
| 31244001 | chemosynthesis | process by which some organisms, such as certain bacteria, use chemical energy to produce carbohydrates | 13 | |
| 31244002 | community | a group of interacting populations of different species | 14 | |
| 31244003 | consumers | organisms that use the food producers make or eat other consumers | 15 | |
| 31244004 | decomposers | organisms that break down wastes and dead organisms and return raw materials to the environment | 16 | |
| 31244005 | detritivores | A heterotroph that derives its energy from nonliving organic material | 17 | |
| 31244006 | distribution | The arrangement of something across Earth's surface | 18 | |
| 31244007 | ecological efficiency | Percentage of energy transferred from one trophic level to another in a food chain or web | 19 | |
| 31244008 | ecology | scientific study of interactions among organisms and between organisms and their environment | 20 | |
| 31244009 | ecosystem | a community of organisms and their nonliving environment | 21 | |
| 31244010 | fermentation | The process by which cells break down molecules to release energy without using oxygen. | 22 | |
| 31244011 | food chain | a series of steps in which organisms transfer energy by eating and being eaten | 23 | |
| 31244012 | food web | consists of the many overlapping food chains in an ecosystem | 24 | |
| 31244013 | genetic diversity | refers to the sum total of all the different forms of genetic information carried by all organisms living on Earth today | 25 | |
| 31244014 | gross primary productivity | the rate at which energy is produced in an ecosystem | 26 | |
| 31246611 | habitat | the area where an organism lives, grows, and develops | 27 | |
| 31246612 | herbivores | consumers that eat only plants | 28 | |
| 31246613 | hydrologic cycles | The cycle through which water in the hydrosphere moves; includes such processes as evaporation, precipitation, and surface and groundwater runoff | 29 | |
| 31246614 | hydrosphere | All the water at and near the surface of the earth, 97% of which is in oceans | 30 | |
| 31246615 | limiting factor | an environmental factor that prevents a population from increasing | 31 | |
| 31246616 | limiting factor principle | Too much or too little of any abiotic factor can limit or prevent growth of a population of a species in an ecosystem, even if all other factors are at or near the optimum range of tolerance for the species | 32 | |
| 31246617 | natural greenhouse effect | The absorption of thermal energy by the atmosphere. It keeps the earth's temperature within a certain range. | 33 | |
| 31246618 | net primary productivity | the rate at which biomass accumulates in an ecosystem | 34 | |
| 31246619 | nitrogen cycle | the transfer of nitrogen from the atmosphere to the soil, to living organisms, and back to the atmosphere | 35 | |
| 31246620 | biogeochemical (nutrient) cycles | elements, chemical compounds and other forms of matter are passed between organisms and parts of the biosphere in a cycle | 36 | |
| 31246621 | omnivores | a consumer that eats both plants and animals | 37 | |
| 31247151 | photosynthesis | process by which plants and some other organisms use light energy to convert water and carbon dioxide into oxygen and high-energy carbohydrates such as sugars and starches | 38 | |
| 31247152 | population | a group of individuals of the same species occupying a given area. | 39 | |
| 31247153 | producers | organisms that make their own food through photosynthesis | 40 | |
| 31247154 | pyramid of energy flow | energy loss for a simple food chain | 41 | |
| 31247155 | range of tolerance | Range of chemical and physical conditions that must be maintained for populations of a particular species to stay alive and grow, develop, and function normally. | 42 | |
| 31247156 | secondary consumers | animals that would feed off of herbivores or primary consumers | 43 | |
| 31247157 | species | group of similar organisms that can breed and produce fertile offspring | 44 | |
| 31247158 | stratosphere | the layer of the atmosphere that contains the ozone layer; temperature increases as you go up | 45 | |
| 31247159 | sulfur cycle | Cyclic movement of sulfur in different chemical forms from the environment to organisms and then back to the environment. | 46 | |
| 31247160 | third and higher level consumers | Carnivores that feed on other carnivores. | 47 | |
| 31247161 | trophic level | a step in the movement of energy through an ecosystem; an organism's feeding status in an ecosystem. | 48 | |
| 31247162 | troposphere | the layer closest to Earth, where almost all weather occurs; the thinnest layer | 49 |
