Human cells have several essential characteristics. They provide structure and support to the body of an organism1. The cell interior is organized into different individual organelles surrounded by a separate membrane1. The nucleus (major organelle) holds genetic information necessary for reproduction and cell growth1.

Human evolution is the process by which human beings developed on Earth from now-extinct primates. Viewed zoologically, we humans are Homo sapiens, a culture-bearing upright-walking species that lives on the ground and very likely first evolved in Africa about 315,000 years ago2.
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