Sentences with phrase «populations over hundreds of thousands of years»
Not exact matches
In Colorado, for instance, state and federal fisheries experts were recently spending hundreds of thousands of dollars a year over five years to restore populations of a threatened subspecies of trout, the greenback cutthroat.
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Populations that preceded H. sapiens likely reached India and developed regional versions of Middle Paleolithic tools over several hundred thousand years, says archaeologist Michael Petraglia of the Max Planck Institute for the Science of Human History in Jena, Germany.
The second surge swelled our population a hundredfold to about five hundred million over the next eight thousand years, following the domestication of plants and animals.