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2. Harrison, & J, R. (2025, 31 julio). Human reproductive system | Definition, Diagram & Facts. Encyclopedia Britannica. https://www.britannica.com/science/human-reproductive-system https://www.britannica.com/science/human-reproductive-system

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

4. Reproduction. (s. f.). ScienceDirect. https://www.sciencedirect.com/topics/immunology-and-microbiology/reproduction#:~:text=in%20Small%20Animals-,Reproduction%20is%20a%20critical%20biological%20process%20in%20all%20living%20systems,human%20and%20companion%20animal%20consumption. https://www.sciencedirect.com/topics/immunology-and-microbiology/reproduction#:~:text=in%20Small%20Animals-,Reproduction%20is%20a%20critical%20biological%20process%20in%20all%20living%20systems,human%20and%20companion%20animal%20consumption.

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

6. CrashCourse. (2015, 23 noviembre). Reproductive System, Part 4 - Pregnancy & Development: Crash course Anatomy & Physiology #43 [Vídeo]. YouTube. https://www.youtube.com/watch?v=BtsSbZ85yiQ https://www.youtube.com/watch?v=BtsSbZ85yiQ

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