imagine if evolution led human to become complete Herbivorous. We can eat all grass, leaf, fruits, straw and all vegetables, like we do now. But not well design to eat meat. How would that influence human civilization and history?
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If humans were herbivorous we would be like gorillas. Eating a fibrous diet would result in a stronger jaw and muscles. This would retard brain size because jaw muscles are attached to the top of cranium.