Granddad, is that you? Scientists identify humanity's oldest ancestor - a two-inch worm that swam in the sea

Cambridge University scientists found that the extinct Pikaia Gracilens, which lived 505 million years ago, is the ancestor of all vertebrates, including humans, fish, amphibians, reptiles and mammals. Read More Home | Mail Online http://www.dailymail.co.uk/home/index.html?ITO=1490

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