Which of These Would a Paleontologist Most Likely Do to Determine

Multiple Choice

Which of these would a paleontologist most likely do to determine if a fossil represents a reptile or a mammal?

A) Look for the presence of milk-producing glands.
B) Look for the mammalian characteristics of a four-chambered heart and a diaphragm.
C) Use molecular analysis to look for the protein keratin.
D) Examine the teeth.