You covered a lot of the important differences of Homo Erectus from the earlier Homos. Homo Erectus also had a large change in diet from their ability to harness fire and better hunt larger game. They developed smaller teeth, bigger brains, bigger bodies, smaller stomachs, and less body hair due to their consumption of easier to eat and digest food cooked over a fire. To catch this food, Homo Erectus has to use the advantage of endurance versus speed. Three evolutionary developments, energetics, stabilization, and temperature regulation helped level the playing field. Energetics refers to the storage and transference of energy in muscular structure. Stabilization is an adaptation of centre of gravity in the human structure, specifically using the large gluteus maximus to help with balance and core strength. Temperature regulation helps with cooling the body, unlike many four-legged animals, humans have the ability to sweat through pores on their bodies to cool their core temperature without having to stop movement as well as having less body hair to hold in heat. These adaptations gave Homo Erectus the advantage of keeping chase longer than faster animals with burst speeds, eventually tracking them to the point of exhaustion and killing them with blunt tools.
This crap is getting tedious, but keeping record in case there is a claim I didn't do it.
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