Video narration
Did humans evolve through one straight line of stages? Think family tree: we share older ancestors with modern apes, who are relatives, not parents. Branches split, cousins coexist, and some lines end. Human evolution works much the same way. Australopithecus—an early human relative—lived roughly 4 to 2 million years ago. Later, Homo erectus—another human relative—appeared around 1.9 million years ago and spread widely. But that does not mean one simply became the next. Neanderthals and Homo sapiens were close human relatives living at the same time. They were more like neighboring branches than parent and child. And these are only a few names from a much larger family tree. Many human relatives existed, but Homo sapiens is the only human species still living today. So, did humans evolve through one straight line? No. Our story is a branching family tree, not a ladder—and we are its surviving branch.