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3. Human reproduction - Reproduction - KS3 Biology - BBC Bitesize. (2024, 25 junio). BBC Bitesize. https://www.bbc.co.uk/bitesize/articles/zwb6xbk#zm33f82

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5. Nucleus Medical Media. (2013, 31 enero). Fertilization [Vídeo]. YouTube. https://www.youtube.com/watch?v=_5OvgQW6FG4

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7. Nucleus Medical Media. (2013b, enero 31). Fertilization [Vídeo]. YouTube. https://www.youtube.com/watch?v=_5OvgQW6FG4