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Just like all other living creatures man is
built from cells. Billions of specialized cells of human body
originate by mitotic divisions during first 9 months after
fertilization of egg cell. Cells keep dividing throughout the whole
life, so that we grow and continuous cell replacement takes place.
After about 15 years human organism starts producing gametes,
originated in meiosis haploid reproductive cell, that can give
birth to a new life.
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