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Caption: Fertilization. Computer artwork of a human sperm (spermatozoon) successfully penetrating an egg (ovum). Only one sperm can penetrate the egg's thick outer layer (zona pellucida) and fertilize it. Fertilization occurs when DNA (deoxy- ribonucleic acid) released by the sperm fuses with DNA contained in the egg. Women produce a single egg at a time, whilst men release around 500 million sperm. The sperm use their flexible tails to travel through the female reproductive tract. Only a few thousand sperm reach the egg, which is located in one of the Fallopian tubes.

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Keywords: anatomy, artwork, beginning, beginnings, cells, egg, fertilization, fertilizing, gamete, gametes, germ cell, human body, illustration, moving, ovum, penetrating, propelling, reproductive system, sex, sexual reproduction, sperm, spermatozoon, swimming, tail, zona pellucida

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