Humans are descended from worm which lived 500 million years ago - Mirror Online:
The oldest human ancestor is a 500million-year-old worm-like creature no longer than a thumb.
Pikaia gracilens is the most primitive known vertebrate and therefore the ancestor of all descendant vertebrates, including humans.
The tiny creature had the beginnings of a backbone and skeletal muscle making it the oldest ancestor like us.
It is a member of the chordate family, the group of animals that today includes fish, amphibians, birds, reptiles and mammals.
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