Early Ancestors: Early humans evolved from primates, with one of the most significant ancestors being Australopithecus, who lived around 4-2 million years ago. These early hominins walked upright but still had smaller brains than modern humans. Homo habilis: Around 2.5 million years ago, Homo habilis appeared. They had larger brains and began to use simple stone tools, which marked the beginning of the Stone Age. Homo erectus: One of the first species to exhibit more advanced behavior, Homo erectus, emerged about 1.8 million years ago. They used fire, built shelters, and created more complex tools. https://m.youtube.com/channel/UCyuIU0T-YR3Dotyic-KHupg