One population of mammoths lived on in isolation on Russia's remote Wrangel Island until about 5, 000 years ago.
Then there is the third measure, championed by Milanovic himself, which is to treat the world just as one population.
He said the differences from one population to another "cannot be accounted for either by genetic make-up or environmental influences".
It may be that there is only so much economic anxiety that one population can stand at any one time.
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The NIH said the scientists who developed these stem cells lines have told the agency that the stem cells are viable and can be frozen and cultured and have been through more than one population doubling.
Exchange plans could be required to do separate actuarial value calculations: one for the regular Exchange population (using provider rates applicable to that population) and one for the Medicaid population (using the much lower rates typically used by Medicaid health plans).
One is population growth, which will continue to put greater demands on the food production system.
Many low-income countries have less than one mental health specialist per one million population, according to the WHO.
To test the effectiveness of these antibodies, the two researchers injected cells that belonged to one genetic population of mice into the leg muscles of mice from a different genetic population.
The Bombay (Mumbai) meeting is likely to see the anti-globalisation activists focusing on Hinduism's centuries-old social hierarchy, or the caste system, which relegates nearly one-sixth of India's one billion population to the status of low castes known as Dalits, or the oppressed.
About 10% of these untreated individuals (350, 000 people) comprise one-third of the homeless population, one-fifth of the inmates in jails and prisons, and cause at least 10% of all U.S. homicides.
The paucity of family doctors naturally has a particularly strong impact on rural communities, which are home to around one-fifth of America's population but only one-tenth of its doctors, most of whom practise family medicine.
Last year around 715, 000 were started (compared with some 225, 000 in Britain, which has a population one-third bigger than Spain's).
Also, says Bocchini, this is a new strain of flu, and no one in the population would be expected to be immune.
Ah, but wait, by far the majority of those active service members will be male (women only just this past week being cleared for combat operations for example) so perhaps we should use the male suicide rate, not the population one?
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In the 18th century, it was home to one of the largest population of free blacks in the New World even as it became one of the centers of the global slave trade and home to some of its most violent abuses.
The U.S. population is one third smaller than that of the European Union and Switzerland combined.
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The task is complicated by the fact that there isn't one monolithic polar bear population.
According to one recent estimate, one quarter of the population of southern Africa may die of Aids.
These threats pose a host of new technical challenges because they often involve a population of one.
One caveat: Estimating population for comparably defined urban areas, particularly in the developing world, can be difficult.
Istanbul has been in the midst of a fantastic transformation from an impoverished population to one of affluence.
At 1 million residents, it has only one-sixth the population of Massachusetts, according to the U.S. Census Bureau.
Right now, there are more than 50 million Americans of Latino descent -- one sixth of our population.
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Together, the BRICS nations make up more than 40% of the world population and one-fifth of the global economy.
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She added that research indicated hedgehogs were dying out at a rate of one fifth of the population every four years.
There are 166 cities with a population over one million in China at this time, and more are on the way.
The fact is that while wealth can be generated, money generally flows from one side of a population to the other.
"You can achieve the same level of protection for the population at one-third the cost doing an intervention like this, " Fowler said.
The Census Bureau projects that in 2007 migrants, legal and illegal, will increase the U.S. population by one person every 27 seconds.
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