Terms : Hide Images
| 10748788014 | biosphere | part of Earth in which life exists including land, water, and air or atmosphere |  | 0 |
| 10748788015 | species | group of similar organisms that can breed and produce fertile offspring |  | 1 |
| 10748788016 | population | group of individuals of the same species that live in the same area |  | 2 |
| 10748788017 | community | assemblage of different populations that live together in a defined area |  | 3 |
| 10748788018 | ecology | scientific study of interactions among organisms and between organisms and their environment |  | 4 |
| 10748788019 | ecosystem | all the organisms that live in a place, together with their nonliving environment |  | 5 |
| 10748788020 | biome | group of ecosystems with similar climates and typical organisms |  | 6 |
| 10748788021 | biotic factor | any living part of the environment with which an organism might interact | 7 | |
| 10748788022 | abiotic factor | physical, or nonliving component of the environment |  | 8 |
| 10748788023 | autotroph | organism that can capture energy from sunlight or chemicals and use it to produce food from inorganic compounds |  | 9 |
| 10748788024 | primary producer | first producer of energy-rich compounds that are later used by other organisms |  | 10 |
| 10748788025 | photosynthesis | process 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 | |
| 10748788026 | chemosynthesis | process in which chemical energy is used to produce carbohydrates for energy | 12 | |
| 10748788027 | heterotroph | organism that must obtain energy by consuming other organisms; cannot directly acquire energy from the environment | 13 | |
| 10748788028 | consumer | organism that relies on other organisms for its energy and nutrient supply | 14 | |
| 10748788029 | carnivore | organism that obtains energy by killing and eating animals | 15 | |
| 10748788030 | herbivore | organism that obtains energy by eating only plants | 16 | |
| 10748788031 | scavenger | animal that consumes the carcasses of other animals | 17 | |
| 10748788032 | omnivore | organism that obtains energy by eating both plants and animals | 18 | |
| 10748788033 | decomposer | organism that chemically breaks down organic matter to obtain energy and nutrients | 19 | |
| 10748788034 | detritivore | organism that feeds on bits of plant and animal remains and other particles | 20 | |
| 10748788035 | food chain | series of steps in an ecosystem in which organisms transfer energy by eating and being eaten | 21 | |
| 10748788036 | food web | network of complex interactions formed by the feeding relationships among the various organisms in an ecosystem | 22 | |
| 10748788037 | trophic level | each step in a food chain or food web | 23 | |
| 10748788038 | ecological pyramid | illustration of the relative amounts of energy or matter contained within each trophic level in a given food chain or food web | 24 | |
| 10748788039 | biomass | total amount of living tissue within a given trophic level | 25 | |
| 10748788040 | 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 | 26 | |
| 10748788041 | limiting nutrient | single essential nutrient that limits productivity in an ecosystem | 27 | |
| 10748788042 | phytoplankton | photosynthetic algae found near the surface of the ocean | 28 | |
| 10748788043 | zooplankton | small free-floating animals that form part of plankton | 29 | |
| 10748788044 | nutrient | chemical substance that an organism needs to sustain life | 30 | |
| 10748788045 | nitrogen fixation | process of converting nitrogen gas into ammonia that can be furthered converted into forms that plants can absorb and use | 31 | |
| 10748788046 | denitrification | process by which bacteria convert nitrates into nitrogen gas | 32 |
