The results could help explain why the warm tropics are so species-richFrom The BBC:
Climate could have a direct effect on the speed of "molecular evolution" in mammals, according to a study.
Researchers have found that, among pairs of mammals of the same species, the DNA of those living in warmer climates changes at a faster rate.
These mutations - where one letter of the DNA code is substituted for another - are a first step in evolution.
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