AKA Bipedalism. There are numerous theories out there for why, but why do you think it is?
Most Helpful Guy
Well, first not all evolutionary changes are for the better. There are a lot of ideas as to why men walk upright. One is that it takes less energy to run. Another is that it frees your hands up for wielding of tools (that is a pretty good concept).
It could be anything. Change isn't on demand. There are mutations and there is variation. The more children that are created by those with the change the more prominent it is. Sometimes this just means that two people with the change left the population so ALL of their progeny had the change. It is NOT always for a "Reason"1
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