Understanding Evolution

They’re all over the tree

This evolutionary tree shows that there were many other groups of animals whose origins date back to the Cambrian. In fact, the fossil record shows an "explosion" of new life forms originating during this time.

Many groups of animals have been found in Cambrian fossils

Let's take a closer look at two of the arthropod lineages and examine the reasons for their success.


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Understanding Evolution © 2015 by The University of California Museum of Paleontology, Berkeley, and the Regents of the University of California