Currently, two extant elephant species (X and Y) are placed in the genus Loxodonta, and a third species (Z) is placed in the gen
us Elephas. Thus, which statement should be true? Species X and Y are not related to species Z.
A) Species X and Y share a greater number of homologies with each other than either does with species Z.
B) Species X and Y share a common ancestor that is still extant (in other words, not yet extinct).
C) Species X and Y are the result of artificial selection from an ancestral species Z.
D) Species X, Y, and Z share a common ancestor, but nothing more can be claimed than this
Heartburn is a burning discomfort that is generally felt in the chest just behind the breastbone. The burning sensation is caused when harsh stomach juices come in contact with and irritate the delicate lining of the esophagus.