Assertion: wrangel island mammoth | /r/HasProperty | isolated for 5000 years
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text: The Wrangel Island mammoths were isolated for 5000 years by rising post-ice-age sea level, and resultant inbreeding in their small population of about 300 to 1000 individuals led to a 20% to 30% loss of heterozygosity, and a 65% loss in mitochondrial DNA diversity.