The exact nature of the evolutionary relationships between modern humans and their ancestors remains the subject of debate. For the first time in earth’s history, life—with human technology as its agent—can permanently expand from one lonely planet out into the rest of the solar system. To understand where we came from, we must travel back—far beyond history, beyond even memory, into a world without humans at all Life on earth began at least 3.5 billion years ago, perhaps even earlier, in a world utterly alien to our own. According to birth certificates, the life of a child begins once their body comes out of the mother’s womb But when does their organismal life begin
Science holds a palette of answers—depending on how one defines a human life. Ultimately, homo sapiens evolution begins alongside the origin of the chimpanzee family Genetic evidence shows that the last common ancestor of all humans and modern chimpanzees is thought to have lived between six million and nine million years ago in africa. Human history or world history is the record of humankind from prehistory to the present They migrated out of africa during the last ice age and had spread across earth's continental land except antarctica by the end of the ice age 12,000 years ago.
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