The scientific name for a polar bear is Ursus maritimus. The scientific name for an American black bear is Ursus Americanus. Which of the following statements is true?
A. Polar bears are part of the Maritimus genus.
B. Black bears are part of the Ursus species.
C. Polar bears and black bears are part of the same family.
D. Polar bears and black bears are variations of the same species.