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 and Y share a greater number of homologies with each other than either does with species Z.
C) Species X and Y share a common ancestor that is still extant (in other words, not yet extinct).
D) Species X and Y are the result of artificial selection from an ancestral species Z.
E) Species X, Y, and Z share a common ancestor, but nothing more can be claimed than this
The deer mouse and the African elephant represent extremes among mammals of r versus K selection.
Invasive species in Canada include (a) zebra mussels, Dreissena polymorpha, (b) sea lamprey, Petromy
An elephant can use its trunk for a variety of purposes. This one is wiping its eye.
About 80% of all known mollusc species are gastropods (snails and slugs), including the cowry (a sea
Gomphidae is an Odonata family that contains about 90 genera and 900 species. They are commonly refe
Three possible phylogenies for the australopithecines with Au. anamnesis as the stem ancestor and re