Re-analysis of a fossil finds it’s from the earliest vertebrate branch

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Because we're a member of the group, it's easy to see vertebrates as the pinnacle of evolution, a group capable of producing bats, birds, and giant whales in addition to ourselves. But when they first evolved, vertebrates were anything but a sure thing. They branched off from a group that lived in the mud and didn't need to tell its top from its bottom or its left from its right, and so ended up l...

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