From humans to monkeys to lizards to frogs, every known species, both living and extinct, with a jaw and a backbone has paired limbs! Why is this and how did this develop? Trace discusses how our stomachs could be the reason why many species evolved into creatures with four appendages.

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