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abtoitic factor

nonliving parts of an organism's enviroment; temperature, moisture, light and soil


portion of earth tha supports life; extends from the atmosphere to the bottom of oceans

biotic factor

all the living organisms that inhabit an enviroment


an ecological relationship in wich one organism benefits and the other neihter benefits nor is harmed


collection of several interacting popultions that inhabit a common enviroment


scientific study of interactions amoung organisms and their enviroments


interactions amoung populations in a community; the community's physical surroundings' or abiotic factors


place where an organism lives out its life


a form of symbiosis in wich both organisms benefit from living togeather


role and position a species has in its environment; includes all biotic and abiotic interactions as an animal meets its needs for suvival and reproduction


symbiotic relationship in which one organism benefits at the expense of the other species


group of organisms of one species that interbreed and live in the same place at the same time


permanet, close association between twoor more organisms of diffrent species


organisms that use energy from the sun or energy stored in chemical compounds to manufacture their own nutrients


organisms, such as fungi, that break down and absorb nutrients from dead organisms

food chain

beginning with procedures along wich energy is transferred from trophic level to troshic level

food web

the interconnected food chains in an ecosystem


organisms that cannot make their own food and must feed on other organisms for energy and nutrients


animals that feed on animals that have already died

trophic level

a feeding level in an ecosystem

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