Answer:
A. Species X and Y share a greater number of homologies with each other than either does with species Z.
Explanation:
In taxonomy, living organisms are placed into groups according to their similarities.
Genus is a classification group above of species. It consists of species that are closely related.
For the species X and Y to be placed in the same genus, they must be sharing a greater number of similarities or homologies compared to species Z.
Species Z does not have greater similarity with either Species X or species Y