What does it mean to be human?
How does evolution explain complex organisms like humans?
Evolution doesn’t happen all at once, especially in complex organisms such as human beings. Modern humans are the product of evolutionary processes that go back more than 3.5 billion years, to the beginnings of life on Earth. We became human gradually, evolving new physical traits and behaviors on top of those inherited from earlier primates, mammals, vertebrates, and the very oldest living organisms.
How are humans and monkeys related?
Humans and monkeys are both primates. But humans are
not descended from monkeys or any other primate living today. We
do share a common ape ancestor with chimpanzees. It lived between 8 and 6 million years ago. But humans and chimpanzees evolved differently from that same ancestor. All apes and monkeys share a more distant relative, which lived about 25 million years ago.
Did humans evolve in a straight line, one species after another?
Human evolution, like evolution in other species, did not proceed in a straight line. Instead, a diversity of species diverged from common ancestors, like branches on a bush. Our species,
Homo sapiens, is the only survivor. But there were many times in the past when several early human species lived at the same time.
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