The science of population dynamics teaches us that there are really only four factors that influence the size of a population of animals or plants. They are birth rate, death rate, immigration and emigration.
These concepts show us how the No Kill Equation works. Read more here:
http://www.examiner.com/x-35783-Atlanta-Animal-Welfare-Examiner~y2010m3d29-Shelter-Pet-Population-101-Building-No-Kill-Communities-with-the-No-Kill-Equation
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