Read More:
How We Got Four Limbs? Because We Have a Belly: New Model For The Evolution Of Paired Appendages
http://medienportal.univie.ac.at/presse/aktuelle-pressemeldungen/detailansicht/artikel/wir-haben-vier-gliedmassen-weil-wir-einen-bauch-haben-kopie-1/
"All of us backboned animals - at least the ones who also have jaws - have four fins or limbs, one pair in front and one pair behind."

The Lateral Mesodermal Divide: An Epigenetic Model of the Origin of Paired Fins
http://onlinelibrary.wiley.com/doi/10.1111/ede.12061/full
"By examining development at the level of tissues and processes, rather than focusing on gene expression, we have formulated a general hypothesis to explain the dorso-ventral and anterior-posterior placement of paired appendage initiation sites in vertebrates."

Watch More:
When Did Hands & Feet Evolve?
https://testtube.com/dnews/dnews-631-evolved-first-hands-or-feet
TestTube Wild Card
http://testtube.com/dnews/dnews-263-can-you-sneeze-without-closing-your-eyes?utm_source=YT&utm_medium=DNews&utm_campaign=DNWC
Evolution of Throwing
http://testtube.com/dnews/dnews-420-the-evolution-of-throwing

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