SCI 275 Population Size

SCI 275 Population Size - factors Emigration is people...

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The four factors that produce changes in population size are birth rate, death rate, immigration, and emigration. Birth rate is the number of births of a sample size per 1000 people per year. Birth rates are affected by many factors such as the ability to receive health care, family planning, the use and availability of contraceptives, governmental policies, economic growth, education, social and cultural views, and the use of abortion. Death rate is the number of deaths of a sample of per 1000 people per year. Death rates are caused by the lack of availability of food and water, lack of education, disease, lack of medical care, suicide, car accidents, crime, war, and government entities. Immigration is people entering a country for various reasons. Pull Factors – A country offering incentives for immigration, education, social and economic
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Unformatted text preview: factors. Emigration is people leaving a country for various reasons. Push Factors - Social and economic factors, natural hazard, education opportunities, political instability, war, and others. The factors that affect population size in the video are birth rate and death rate. The female Nutria has the ability to give birth to up to 40 young in three years, with the young having the ability to reproduce at six months in age. This would give them the ability to flourish and build a much higher population. The death rate would be in regards to the vegetation population that the Nutria use as a food source. When the food source is depleted one can expected to see the population decline due to death....
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This note was uploaded on 02/11/2011 for the course ETH 125 taught by Professor Jameshenderson during the Fall '09 term at University of Phoenix.

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