Terms : Hide Images
| 490673469 | biosphere | part of Earth in which life exists including land, water, and air or atmosphere | 0 | |
| 490673470 | species | group of similar organisms that can breed and produce fertile offspring | 1 | |
| 490673471 | population | group of individuals of the same species that live in the same area | 2 | |
| 490673472 | community | assemblage of different populations that live together in a defined area | 3 | |
| 490673473 | ecology | scientific study of interactions among organisms and between organisms and their environment | 4 | |
| 490673474 | ecosystem | all the organisms that live in a place, together with their nonliving environment | 5 | |
| 490673475 | biome | group of land ecosystems with similar climates and typical organisms | 6 | |
| 490673476 | biotic factor | any living part of the environment with which an organism might interact | 7 | |
| 490673477 | abiotic factor | physical, or nonliving, factor that shapes an ecosystem | 8 | |
| 490673478 | autotroph | organism that can capture energy from sunlight or chemicals and use it to produce its own food from inorganic compounds | 9 | |
| 490673479 | primary producer | first producer of energy-rich compounds that are later used by other organisms | 10 | |
| 490673480 | photosynthesis | process used plants and other autotrophs to capture light energy and use it to power chemical reactions that convert carbon dioxide and water into oxygen and energy-rich carbohydrates such as sugars and starches | 11 | |
| 490673481 | chemosynthesis | process in which chemical energy is used to produce carbohydrates | 12 | |
| 490673482 | heterotroph | organism that obtains food by consuming other organisms | 13 | |
| 490673483 | consumer | organism that relies on other organisms for its energy and food supply | 14 | |
| 490673484 | carnivore | organism that obtains energy by eating animals | 15 | |
| 490673485 | herbivore | organism that obtains energy by eating only plants | 16 | |
| 490673486 | scavenger | animal that consumes the carcasses of other animals | 17 | |
| 490673487 | omnivore | organism that obtains energy by eating both plants and animals | 18 | |
| 490673488 | decomposer | organism that breaks down and obtains energy from dead organic matter | 19 | |
| 490673489 | detritivore | organism that feeds on plant and animal remains and other dead matter | 20 | |
| 490673490 | food chain | series of steps in an ecosystem in which organisms transfer energy by eating and being eaten | 21 | |
| 490673491 | phytoplankton | photosynthetic algae found near the surface of the ocean | 22 | |
| 490673492 | food web | network of complex interactions formed by the feeding relationships among the various organisms in an ecosystem | 23 | |
| 490673493 | trophic level | each step in a food chain or food web | 24 | |
| 490673494 | zooplankton | small free-floating animals that form part of plankton | 25 | |
| 490673495 | ecological pyramid | illustration of the relative amounts of energy or matter contained within each trophic level in a given food chain or food web | 26 | |
| 490673496 | biomass | total amount of living tissue within a given trophic level | 27 | |
| 490673497 | biogeochemical cycle | process in which elements, chemical compounds, and other forms of matter are passed from one organism to another and from one part of the biosphere to another | 28 | |
| 490673498 | limiting nutrient | single essential nutrient that limits productivity in an ecosystem | 29 | |
| 490673499 | nutrient | chemical substance that an organism needs to sustain life | 30 | |
| 490673500 | nitrogen fixation | process of converting nitrogen gas into nitrogen compounds that plants can absorb and use | 31 | |
| 490673501 | denitrification | process by which bacteria convert nitrates into nitrogen gas | 32 |
