Elephants are the largest land animals alive today. They are the only mammals
to have four knees. Evidence of extinct wooly mammoths show that they shared
the trait of having four knees, but they were not African or Asian elephants. How
could the mammoths and elephants share this characteristic?
A. Today's elephants are clones of the woolly mammoths.
B. Elephants and woolly mammoths had a common ancestor.
C. Today's e
lephants have adapted to look like woolly mammoths.
D. Woolly mammoths are one of the three species of today's elephants.