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Caption: Fertilization. Computer artwork of one of a group of human sperm (spermatozoa) 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 (deoxyribonucleic 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, cells, circle circles, egg, fertilization, fertilizing, gamete, gametes, germ cell, human body, illustration, journey, journeying, journeys, many, motion action, move movement moving, moving, multiple, ovum, penetrating, propelling, reproductive system, round shape, rounded circular, sex, sexual reproduction, sperm, spermatozoa, spermatozoon, swimming, tail, tails, travel, travelling, travels, zona pellucida

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