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.

According to ohrp, a problem is an “unanticipated problem” when it meets which of the following criteria: unexpected, related or possibly related to the research, suggests that the research does not put the subjects or others at greater riskunexpected, related or possible related to the research, suggests the research puts subjects or others at greater riskunexpected, unrelated to the research but still occurring with a subject, suggests the research puts others at greater riskexpected, related or possible related to the research, suggests the research puts others at greater risk