ecology terms
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| Ecology | is the scientific study of interactions among organisms and between organisms and their enviroment, or surroundings
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| Biosphere | contains the combined portions of the planet in which all of life exists, including land, water, and air, or atmosphere
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| species | is a group of organisms so similar to one and another that they can breed and produce fertile offspring
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| population | groups of individuals that belong to the same species and live in the same area
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| community | assembleges of diffrent populations that live toghter in a defined area
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| ecosytstem | is a collection of all the organisms that live in a particular place, toghter with their nonliving, or phyisical enviroment
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| autotroph | capture energy from sunlight or chemicals and use that energy to produce food
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| heterothrophs | organuisms that rely on other organisms for their foood and energy supply
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| food web | when the feeeding realtionships among the various organisms in an ecosystem from a network of complex interactions
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| trophic levels | each step in a food chain of food web
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| biomass | the amount of living tissue withen a given trophic level
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| biogeochemical cycle | elements, chemical compounds, and other froms of matter are passed from one organism to another and from one part of the biosphere to another
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| limiting nutrient | when an ecosystem is limited by a single nutrient that is scarce or cycles very slowly
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| weathter | is the day to day condition of earths atomosphere at a apticular time and place
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| climate | refers to the average year after year conditionds of tempature and precipitation in a region
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| green house effect | the natural situatiuon in which heat is retained by this layer of greenhouse gases
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| biotic factor | the biological influnces on organisms within an ecosystem
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| abiotic factor | physical or nonliving factors that shape ecosystems
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| niche | is the full range of physical and biological conditions in which an organism lives and the way in which the organism uses thoose conditions
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| logistic growth | when a populations growth slows or stops following a period of exponential growth
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| carrying capacity | the largest number of individuals that the enviroment can support
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| demography | the scientific study of human population
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| demograhic transition | a dramitic changes in birth and death rates
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| green revoultion | the use of chemicalfertilizers to greatly increase the worlds food supply
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| renewable resource | can regenrate if they are alive or can be replinished by biochemical cycles if they are nonliving
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| pollutant | is a harmful material that can enter the biosphere throught the land, air, or water
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| biodiversity | the sum total of the genetically based variety of all organisms in the biosphere
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| biological maginifaction | concertrations of a hramful stubstance increases in organisms at higher trophic levels in a food chain of food web
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