✔ 最佳答案
We don't have evidence of primitive people cutting their hair, but they did sometimes tie it back or braid it. If they had wanted to, it wouldn't have been hard--those flint tools skinned and butchered animals, so they certainly could cut hair.
Nature gave humans long hair for a reason. It protected them from cold, sunburn, insect bites, etc. And it acted as a pillow when they slept. It's also possible their hair contained pheromones (sex lures), now only found in pubic hair.