This February 2018 video says about itself:
Research explains how snakes lost their limbs
The study is part of an effort to understand how changes in the genome lead to changes in phenotypes
February 6, 2019
Snakes and lizards are reptiles that belong to the order Squamata. They share several traits but differ in one obvious respect: snakes do not have limbs. The two suborders diverged more than 100 million years ago.
Identification of the genetic factors involved in this loss of limbs is a focus of the article “Phenotype loss is associated with widespread divergence of the gene regulatory…
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