Prehistoric were basically apes that could stand upright but. They exactly all other apes would eat, sleep, and mate.
Why we Walk on Two Legs
There is actually many reasons we walk on two legs. One of the reasons is because standing on two legs help us mate. The other reason is so we can scout out places.
The Different Species
When the Humans Apes were growing other species started to become more human like and more ape like. Actually some species fought other species for food. Some human like ape species went extinct.
Neanderthal blood almost runs through everyone's veins today. The reason it does is because Neanderthals mated with humans and they had kids that had Neanderthal blood.
Hope you enjoyed.