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Ecology flash cards


Ecology is the scientific study of interactions among organisms and between organisms and their enviroment
Biosphere contains the combined portions of the planet of which all life exisits
species is a group of organisms so silmilar to one another that they can breed and produce ferile offsprings
population is groups of individuals that belong to the same species and live in the same area
community is a assemblags of different polpulations that live together in a defined area
ecosystem of all the organisms that live in a particular place
autotroph are organisms that use energy from the enviroment to fuel the assembly of simiple inorganic compounds into a complex organic molecules
heterotroph organisms that rely on other organimsms for energy and for food
food web are relationships among the various organisms in an ecosystem to form a network
trophic level is each step in the food chain
biomass total amount of living tissue within a given trophic level
biogeochemical cycle process in which elements chemical compunds and other forms of matter are passed from one organisms to another and form one part of the biosphere to another
limiting nutrient single nutrient that either is scarce or cycles very slowly limiting the growth of organisms in an ecosystem
weather condition of earths atmosphere at a particular time and place
climate average year after year conditions of temperature and precipitations in a particular region
green house effect natural situation in which heat is retained in earths atmosphere by carbnon dioxide, methane, water vapor and other gasses
biotic factor bilogical influences on organisms within an ecosystem
abiotic factor physical, or nonliving, factor that shapes an ecosystem
niche full range of physical and biology conditions in which an organisms lives and the way in which the organisms uses those conditions
logistic growth growth pattern in which a populations growth rate slows or stops following a period of exponetial growth
carrying capacity largest number of individuals of a population that a given enviroment can support
demography transition change in population from high birth and death rates to low birth and death rates
demography scientific study of human populations
green revolution the delopment of highly productive crop strains and the use of modern agricultural techniques to increase yields of food crops
renewable resource resources that can regenerate quickly and that is replaceable
pollutant harmful material that can enter the biosphere through air, land and water
biodiversity bilogical diversirty: the sum total of the variety of organisms in the biosphere
biological magnificant increasing concentration of a harmful substance in organisms at higher trophic levels in a food chain or food web
Created by: jackewles



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