However , recent studies suggest that bipedality without the ability to use fire would not have allowed global dispersal .
A new study provides support for the hypothesis that walking on two legs , or bipedalism , evolved because it used less energy than quadrupedal knuckle - walking .
Recent studies suggest that bipedality without the ability to use fire would not have allowed global dispersal .
A new study provides support for the hypothesis that walking on two legs , or bipedalism , evolved because it used less energy than quadrupedal knuckle - walking .