Obugambo obw'Ahansi

a Omu kitabo The Descent of Man, ekyahandiikirwe Charles Darwin akagamba aha bicweka by’omubiri bingi “nk’ebitaine mugasho.” Omwe aha barikumuhorereza akagira ngu hariho ebicweka bingi ebiri omu mubiri gw’omuntu ebitari bikuru, nk’enturugunyu n’obundi bucweka bukye oburi omu mubiri gw’omuntu.