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Grass. When grass took over the world virtually at the same time there were less trees in between, so apes had to walk the grasslands in search of food. The best way to do this is to walk upright, stand tall looking out for predators, and it frees up our hands to have 5 fingers to hold stuff better with and work with our environment to build things.
There wouldn't even be apes if it wasn't for dinosaurs going extinct due to an asteroid. Mammals could only be small creatures as long as dinosaurs were in control, but I wouldn't say dinosaurs are superior, for they were sinful killing machines influenced altered by Satan, fallen angels and demons. Hence, day 2 in Gen. 1.9 unlike the other days of restoration was not called a 'good day,' because when the firmament was split unfortunately up came some of those demonic spirits from the deep (or abyss) to negatively impact the creatures on earth in earth's earliest ages before Adam was born in the Garden of Eden 4004 BC. This would explain how the serpent could enter the Garden to entice man to rebel against God which in God's great awareness gave man a fully developed free-will to have the free-choice.