Pikaia Gracilens Revealed as Possible Genetic Ancestors to All Vertebrates
The Middle Cambrian Pikaia gracilens, from 505 million years ago, was a fish-like worm, which has the possible dubious distinction of being one of humanity’s…
The Middle Cambrian Pikaia gracilens, from 505 million years ago, was a fish-like worm, which has the possible dubious distinction of being one of humanity’s…