Which of the Following Would Be Considered a Separate Species

Multiple Choice

Which of the following would be considered a separate species as defined by the biological species concept?

A) the red maple and the sugar maple, which are found throughout large parts of North America, but rarely hybridize
B) two populations of fox squirrels, one that lives on a hillside, and one that lives in the river valley
C) two populations of North American orioles, one that lives on the east coast, and one that lives on the west coast
D) separate populations of bobcats, one that lives on a rocky slope, and one that lives in an upland forest several miles distant
E) the Chihuahua and the Siberian husky, two different breeds of dog