Bactrian camels, dromedaries, llamas, and alpacas are all members of the same taxonomic
family, Camelidae. Members of this family all have two toes, no hooves, true canine teeth, and
a split upper lip. The family Camelidae originated in North America. The physical features of
animals in this family and the family's geographical origin provide evidence that all these
animals -
A. live in the same type of ecosystem
B. have a common ancestor
C. exchanged DNA at some point in the past
D. have slowly evolved to become herbivores