Currently, two extant elephant species (X and Y) are placed in the genus Loxodonta, and a third species (Z) is placed in the genus Elephas. Thus, which statement should be true?
a. Species X and Y are not related to species Z.
b. Species X, Y and Z share a common ancestor, but nothing more can be claimed than this.
c. Species X and Y are the result of artificial selection from an ancestral species Z.
d. Species X and Y share a greater number of homologies with each other than either does with species Z.
e. Species X and Y share a common ancestor that is still extant (in other words, not yet extinct).
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