UmTlolo Ongenzasi

a Encwadinakhe ethi, The Descent of Man, uCharles Darwin wakhuluma ngezitho zomzimba ezinengi ‘njengezinganasidingo.’ Nomunye wabasekeli bakhe wangezelela ngokuthi zinengi khulu “izitho ezinganamsebenzi” emzimbeni womuntu, kuhlanganise nethumbu i-appendix kunye ne-thymus.