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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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