Abruptly Warming Climate Triggered Megabeast Revolutions

Abruptly Warming Climate Triggered Megabeast Revolutions.Around 34,000 years ago, woolly mammoths went extinct from parts of Europe, only to be replaced by… woolly mammoths. The two groups—the disappearing individuals and their substitutes—belonged to the same species. If you looked at their fossils, you probably couldn’t tell them apart. Their genes, however, reveal them to be part of two genetically distinct lineages, one of which suddenly displaced the other.

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