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
Connell's experimental manipulation of species indicated the presence of competition.
Keystone species.
Species of the algal genus Dinobryon not only photosynthesize, but are also efficient predators of b
New Species (BAT)
Three queens, fertile females in species that have a reproductive division of labor.
Evolution of the genus Equus