| Term | Definition |
| Ecology | study of interactions among organisms and environment |
| Species | a group of similar organisms that can breed and produce offspring |
| Community | all of the different populations in an area |
| Biome | group of ecosystems in an area |
| Autotroph | organism that makes its own food |
| Herbivore | eats only plants |
| Consumer | relies on other organisms for its energy and food |
| Photosynthesis | process in which light converts water and CO2 into glucose and O2 |
| Carnivore | an organism that eats only animals |
| Population | group of individuals of a species in an area |
| Producer | an organism tha makes its own food and captures energy |
| heterotroph | organism that gets energy from food it consumes |
| omnivore | consumes plants and animals |
| food chain | series of steps where energy is transfered by being eaten or eating |
| trophic level | each step in the food chain or web |
| evaporation | process where liquid changes to gas |
| transpiration | process of water evaporating from the leaves of plants |
| ecosystem | all the communities in an area plus the nonliving parts |
| decomposer | organism that breaks down organic matter |
| weather | day to day conditions in an area |
| Climate | average, year to year temperature and precipitation conditions |
| greenhouse effect | natural situation where heat is captured in the earths atm |
| biotic | living factors that help to shape an ecosystem |
| abiotic | nonliving factors that help shape an ecosystem |
| niche | range of biotic and abiotic factors and how an organism useds them |
| mutualism | interaction of 2 organisms and both benefit |
| commensalism | interaction of 2 organisms, one benefits and other remains neutral |
| parasitism | interaction of 2 organisms, one benefits other is harmed |
| predation | interaction of 2 organisms, one captures adn consumes the other |
| symbiosis | interaction of two organisms living in close proximity |
| ecological succession | series of predictable changes that happen in an environment |
| biosphere | all of the worlds ecosystems |
| food web | all of the food chains in a specific ecosystem |
| ecological pyramid | the energy diagram that shows the different amounts of energy at each trophic level |
| biomass | total amount of living tissue at a specific trophic level |
| condensation | process in which water vapor is changed into liquid |
| habitat | area where an organism lives |
| biome | group of ecosystems that have the same climate and dominant species |
| limiting factor | factor that limits the growth of a population |
| demography | scientific study of human populations |