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| ecology | scientific study of interactions among organsims and between organsims and their enviroment
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| biosphere | part of Earth in which life exsists including land, water, and air or atmoshere
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| species | a group of similar organisms that can breed and produce fertile offspring
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| population | group of individuals of the same species that live in the same area
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| community | assemblage of a different populations that live together in a define area
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| ecosystem | collection of all the organisms that live in a perticular place, all together without their nonliving enviroment
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| autotroph | organism that can capture energy from sinlight or chemicals and use it to produce its own food from inorganic compounds; also called a producer
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| heterotrouph | organsi that obtains energy from the foods it consumes; also called a consumer
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| food web | network of complex interactions formed by the feeding relationships among the various organsims in an ecosystem
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| trophic level | step in a food chain or food web
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| biomass | total amount ot living tissue within a given trophic level
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| biogeochemical cyle | process in whcin elements, chemical compounds, and other forms of matter are passed from one organism to another and from one part of the bioshere to another
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| limiting nutrients | single nutrients that eitehr is scarce or cycles very slowly, limiting the growth of organisms in an ecosystem
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| weather | condition of Earth's atmosphere at a particular time and place
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| climate | average year-after-year conditions of temperature and precipitation
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| greenhouse effect | natural situation in which heat it retained in Earth's atmosphere
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| abiotic factor | physical, or nonliving, factor that shapes an ecosystem
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| niche | the wat in which the organisms use thoughs condtions
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| logistic growth | growth rate slows or stops following a period of expotential growth
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| caryying capacity | largest number of individuals of a population that a given enviroment can support
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| demography | scientific study of human populations
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| demographic transition | change in population from high birth and death rates to low brith and death rates
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| green revolution | techniques to increase yeilds of food crops
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| renewable resource | resources that can regenerate
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| pollutant | harmful material that can enter the biosphere throught the land, air, or water
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| biodiversity | biological diversity; the sum of the total variety of organsims in the bioshere
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| biological magnifications | increasong consentration of a harmful substance in organsims at higher trophic levels in a food chain or food web
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