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Ecology 7

Mrs Williams

on 12 September 2010

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Transcript of Populations

Growth Population density is the number of individuals per unit of area. Three factors that can affect population size

Number of births
Number of deaths
Number of individuals that enter or leave the population Immigration = the movement of individuals into an area

Emigration = the movement of individuals out of an area Exponential Growth occurs when the individuals in a population reproduce at a constant rate. (Ideal conditions)

Logistic Growth occurs when the individuals in a population's growth slows or stops following a period of exponential growth.
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