<<Blair Hedges, an evolutionary biologist at Pennsylvania State University, US, says: "In one fell swoop, this new fossil kind of casts doubt on the aquatic hypothesis."
His DNA sequencing studies suggest a terrestrial origin for snakes. And he says that, looking at evolutionary history, it is difficult to find examples of limb loss in an aquatic environment.>>
Can somebody please explain how DNA sequencing was done in relation to this fossil?