Assertion: external genitalia | /r/CapableOf | provide morphological basis
Facets:
value: by their variation
type: OTHER
Source sentences:
text: The functions of the individual organs of reproductive systems are fairly uniform throughout the primates, but, in spite of this physiological homology, there is a remarkable degree of variation in minor detail of organs between groups—particularly in the external genitalia, which, by their variation, provide a morphological basis for the reproductive isolation of the species.