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Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican
Earth’s history is divided into nested sets of time--eons, eras, periods, and epochs--and is called
In 1839 Mary Cragin, at the age of twenty-nine, became a convert to John Humphrey Noyes’s “communism
The developing and emerging nations have high rates of population growth
Population age 65 and over and age 85 and over, selected years 1900-2008 and projected 2010-2050.
A graphic depiction of predisposing alleles characteristic of a threshold trait within a population,