unity of the human species造句

The central conclusion of the work is the unity of the human species, which has been acted upon by causes which have since divided it into permanent varieties or races.
"Anti-racist PC agendas and the American Anthropological Association's recent confirmation of the unity of the human species have led to the belief that race is a socio-political invention that promotes racism.
Down's paper also argued that if mere disease is able to break down racial barriers to the point of causing the facial features of the offspring of whites resemble those another race, then racial differences must be the result of variation, affirming therefore the unity of the human species.
Where Down presented his observation that white parents could have offspring who bore a superficial resemblance to other races as evidence of " the unity of the human species, " Crookshank argued the reverse, allying himself with the views of his German translator Eugen Kurtz to claim that the different human races were in fact different species descended from different species of apes.
It's difficult to find unity of the human species in a sentence. 用unity of the human species造句挺难的