1. Humans can walk up right, and we have opposable thumbs both of which have propelled mankind to the top of the evolutionary ladder. compared to other species we have a huge advantage in the way of life for example if Gorillas could stand upright instead of walking on all fours and if they could communicate the same way we can then they could become the dominate force if the Gorillas had the intellect we have mixed with there brute strength they could drive the human species to extinction.

This is the fossil skeleton of lucy the "cave person" found in africa
This is a fossil of a Homo Habilis skull (Homo Habilis-called handyman because they were the first tool makers)
This is a fossil of a Homo Erectus skull (First to migrate from Africa)
This is the fossil of a Homo Sapien skull (Much larger brain)
This is a fossil of a Neanderthal skull (Used advanced tools, Buried the dead)
This is a fossil of a Cro-Magnon skull (Homo sapiens that live in Europe)