Read More:
How We Got Four Limbs? Because We Have a Belly: New Model For The Evolution Of Paired Appendages
"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
"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?
TestTube Wild Card
Evolution of Throwing


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