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Date: 2015-04-16 07:36:01Semen Behavior Germ cells Sperm bank Spermatozoon Sperm Fertilisation Sexual reproduction Sperm competition Biology Fertility Reproduction | Sperm cells compete in a never-ending raceAdd to Reading ListSource URL: phys.orgDownload Document from Source WebsiteFile Size: 50,20 KBShare Document on Facebook |