http://sciencereviewgames.com/srg/subjec/topic.php?topic=Reproduction%20and%20Development
http://www.bbc.co.uk/science/humanbody/body/interactives/lifecycle/teenagers/
http://interactivehuman.blogspot.com.es/2008/05/reproductive-system-game.html
http://www.wartgames.com/themes/humanbody/systems.html
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