How did the evolution of men take place in the stone age

It happened just like it does to all creatures: natural selection. The genus Homo, of which all human species belong, first appeared during the Paleolithic (Old Stone Age) around 2.5 million years ago. We developed from early ape-like animals that had left the trees for wooded grasslands. Individuals born with successive beneficial genetic mutations which allowed for bipedal locomotion, as well as smaller, task-oriented hands better suited for finer tool work, and larger brains, survived better than those who didn’t; so these traits were passed on to the following generations. These small changes compounded over hundreds of thousands of years, resulting in numerous human species–e.g., H. habilis, H. erectus, H. Neanderthalensis, etc.–with skeletons more and more similar to ours. Anatomically modern humans appeared around 200,000 years ago. Behaviorally modern humans appeared around 50,000 years ago. Beyond a difference in the gracility of our skeletons (the former’s being far more robust), the thing that sets the two apart was the evolution of a brain gene that gave us the use of language via better controlled oral muscles. More modern examples of evolution include the development of non-brown eye color around 10,000 years ago, and an enzyme to help us digest dairy products around 8,000 years ago. These last two traits were, again, driven by selection. Blue eyes may have been a trait favored via sexual selection, meaning woman and men of certain early human groups probably favored mates with such eye color. The only people in the world who can drink milk are descended from those who domesticated cattle early on. Therefore, people born with the genetic mutation that allowed them to metabolize milk sugars would survive longer than those who couldn’t because milk is loaded with calcium, protein, and essential vitamins.