Shark Gills Might Be Why You Can Walk
Researchers have found a link between human limbs and the gills of sharks and their relatives.By Mikah Sargent | April 19, 2016
A German scientist once theorized animals' limbs — arms, legs and wings — had evolved from shark gills.
A century and a half later, there's evidence he could be right. Researchers from the University of Cambridge have re-examined the theory by studying fish embryos, specifically the gills of a skate, which are related to sharks.
They found "striking similarities" between how skates' gill structures are formed and the way human limbs are formed, and it all centers around a gene named after a certain video game character.