Answer:
Human evolution is the long process of change that led to humans descended from apelike predecessors. Science data indicates that the physical and behavioral qualities shared by all humans evolved from apelike predecessors during a six-million-year timeframe.
Bipedalism, or the capacity to walk on two legs, was one of the first defining human qualities to arise around 4 million years ago. Other essential human features, such as a large and complex brain, the ability to produce and utilize tools, and the ability to communicate, emerged later. Several advanced qualities, including as rich symbolic expression, art, and intricate cultural variation, have arisen mostly in the last 100,000 years.
Human beings are primates. Physical and genetic similarities reveal that the contemporary human species, Homo sapiens, is closely related to the apes, another group of primate species. Humans and the African great apes (big apes) — chimps (including bonobos, or "pygmy chimps") and gorillas — share an ancestor who lived between 8 and 6 million years ago. Humans first originated in Africa, and much of human evolution took place there. Early human fossils dating from 6 to 2 million years ago were discovered entirely in Africa.
Most scientists now distinguish 15 to 20 distinct species of early humans. Yet, scientists disagree on how these species are linked or which ones simply went off. Many early human species, if not the vast majority of them, left no living progeny. Scientists also disagree on how to identify and classify specific early human species, as well as what circumstances drove the evolution and extinction of each species.
Early humans most likely traveled from Africa to Asia between 2 million and 1.8 million years ago. They arrived in Europe between 1.5 million and 1 million years ago. Several portions of the earth were colonized much later by modern human species. Humans first arrived in Australia, for example, presumably within the last 60,000 years, and in the Americas within the last 30,000 years or so. Agriculture's beginnings and the birth of the earliest civilizations occurred within the last 12,000 years.
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