The island fox shares a common ancestor with the gray fox, Urocyon cinereoargenteus, which is found on the mainland.

A. Both species have similar coloration and a diploid chromosome number of 66.
B. One structural difference between the two species is the reduced size of the island fox, a feature known as dwarfism.
C. The various island subspecies also differ from each other in size, number of tail vertebrae, and other characteristics.
D. The phylogenetic tree below shows the evolutionary relationships between the island fox subspecies and the gray fox.
E. Drag the labels to their appropriate locations on the tree.