Quote:
Originally Posted by Glenzig
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Yeah I had absolutely no idea. Thanks. Here's a quote from that wiki page for you.
"Vertebrates originated about 525 million years ago during the Cambrian explosion, which saw the rise in organism diversity."
So the question still remains.
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It also talks about the earliest known vertebrates and give you names for them. If you want an answer I am not going to hold you hand through the entire process. We have search engines like google that anyone, including yourself, can use. Quite demanding that I know every single fact...I am not a biologist. If you want deeper explanations all you have to do is look.