http://en.wikipedia.org/wiki/Animal
Aside from them, most known animal phyla make a more or less simultaneous appearance during the Cambrian period, about 542 million years ago.It is still disputed whether this event, called the Cambrian explosion, is due to a rapid divergence between different groups or due to a change in conditions that made fossilization possible.
Aside from them, most known animal phyla make a more or less simultaneous appearance during the Cambrian period, about 542 million years ago.It is still disputed whether this event, called the Cambrian explosion, is due to a rapid divergence between different groups or due to a change in conditions that made fossilization possible.
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