Tetrapod anatomy: Backbone back-to-front in early animals

From: sheri p.
Sent on: Monday, January 14, 2013 11:56 AM
http://www.bbc.co.uk/news/science-environment-20987289

Okay - I am being honest here and feel stupid, but I don't know what exactly they are saying here.  I am confused.

Any help in explaining this would be great.

Thanks,
Sheri

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