Population Size

The nation size of a given nation or the world as a whole is stirred by a variety of factors including birth , dying , fertility , and migration pass judgment . Thus , birth , or fertility , and finale pass judgment are interconnected in the following formulaBirth station (b ? death rate (d rate of native increase (r (Human cosmos GrowthIn the US where 14 people are born per 1000 a year on average , and 8 people discover for the same amount , the natural growth rate is 14-8 6 per thousandRecently , most nations experienced surges in natural growth rate triggered primarily by declines in death rates . These declines , in turn were caused by better nutrition , better health care , improved living standards , improved sanitation and immunization (Human Population Growth . Birth rates are typically lower in developed nations due to greater airing of family planning possibilities and cultural shifts , for instance , increase in the quash of working women or greater focus on self-realizationMigration rate is another important factor defining the population size Thus , in a nation that experiences negative natural growth rate , the demographic situation poop be corrected by influx of foreigners through migration . In the US , for instance , immigration is a major baffle adding on average about 1 .1 gazillion legal and 700 ,000 wicked immigrants to the population annually (CAIR , n .d .

Besides , the situation is affected by the fact that new immigrants tend to have higher(prenominal) fertility rates so that by 2050 most population growth will be driven by post-1970 immigrants , spot the pre-1970 population , is on track to peak at 247 million in 2030 and then gradually decline (CAIR n .d . Migration is attracted to regions that portray high living standards and promise future economic developmentIn this substance , birth , death , and migration rates all exert influence on population size . These influences can offset distributively other : for instance where birth rate falters , lower death rate can boost population growth Migration can also serve as an important factor in increasing population in places where natural growth has been slowReferencesColorado alignment for Immigration Reform (CAIR (n .d . U .S . Population and Immigration data , Projections and Graphs . Retrieved marchland 31 , 2006 from http /www .cairco .org /data /data_us .htmlHuman Population Growth . Retrieved March 31 , 2006 , from http /users .rcn .com /jkimball .ma .ultranet /BiologyPages /P /Populations .htm lPAGEPAGE 3POPULATION SIZE31 March 2006...If you want to get a full essay, order it on our website: Ordercustompaper.com

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