Principles of Ecology

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abtoitic factor

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

biosphere

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

commensalism

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

community

collection of several interacting popultions that inhabit a common enviroment

ecology

scientific study of interactions amoung organisms and their enviroments

ecosystem

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

habitat

place where an organism lives out its life

mutualism

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

niche

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

parasitism

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

population

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

symbiosis

permanet, close association between twoor more organisms of diffrent species

autotroph

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

decomposer

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

heterotrogh

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

scavenger

animals that feed on animals that have already died

trophic level

a feeding level in an ecosystem

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