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La fecundaci. s la uni d'un vul i d'un espermatozoide.En produir-se la fecundaci s'inicia una nova vida.Per tal que hi pugui haver fecundaci un home i una dona han de tenir relacions sexuals.En la uni sexual el penis erecte de l'home ejacula el semen a l'interior de la vagina de la dona..

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LA REPRODUCCI segona part

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