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# of organisms being born high BR= growing population

# of organisms being born high BR= growing population. # of organisms dying high DR= declining population. Organisms that migrate into an area. Organisms that leave an area. Occurs under ideal conditions 
​with unlimited resources.

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# of organisms being born high BR= growing population

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  1. # of organisms being born high BR= growing population # of organisms dying high DR= declining population Organisms that migrate into an area Organisms that leave an area Occurs under ideal conditions 
​with unlimited resources Exponential growth that levels 
​off due to limiting factors The maximum number of individuals an 
​ecosystem can support given its resources Factor that controls the 
​growth of the population (Limits it) Human Population Science of overpopulation

  2. Changes in a community, new populations replace old ones Small plants (mosses) die, create soil -soil provides base for larger plants -After many years, large trees take hold

  3. Colonization of new sites by communities. 
​Takes place on bare rock Pioneer organisms: First organisms that move into bare 
​environments & colonize new areas -Takes place on existing soil -Community changes which takes place when a 
​community is disrupted by natural disaster -Stable community that undergoes little/
​no succession (change) Forest fires, Farming, Deforestation Effects caused directly/
​indirectly by human activity Variety of life in an area

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