follow these links
monthly cycle
http://health.howstuffworks.com/menstruation.htm
http://msnbcmedia.msn.com/i/msnbc/Components/Interactives/Health/WomensHealth/zFlashAssets/menstrual_cycle_dw2%5B1%5D.swf
spermatogenesis and oogenesis
http://wps.aw.com/bc_martini_eap_4/40/10469/2680298.cw/content/index.html
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