What would be different If we walked on four these days?
In: Biology
We could have stayed on 4 but being bipedal became more advantageous. It allows for running mechanics that are better suited to distance running. Sure most quadripeds are faster than us in a sprint, but most of them also tire a lot faster than we do. There are other factors at play too(sweat, hairlessness, cooked food) but being bipedal also contributes.
Additionally you need to be bipedal in order to be able to throw a significant distance, which greatly helps with hunting. Even gorillas who are mostly bipedal and way more muscular have a fairly pitiful throwing ability in comparison because they lack the mechanics for a good throwing form.
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