80. And herein I think lies the chief, if not the only reason, why the male and female in mankind are tied to a longer conjunction than other creatures, viz. because the female is capable of conceiving, and de facto is commonly with child again, and brings forth too a new birth, long before the former is out of a dependency for support on his parents help, and able to shift for himself, and has all the assistance is due to him from his parents:
80. Hau da nire ustez arrazoi nagusia, ez bada bakarra, gizakien artean ar eta emearen arteko elkarketak gainontzeko izakien artean baino denbora gehiagoz irauteko: emea gai baita haur gehiago sortzeko, eta de facto haurdun egoten da, aurreneko umeak gurasoekiko dependentzia galdu baino lehen; haurra oraindik ez denez gai bere kasa ibiltzeko gurasoen laguntza beharko du.