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. have slowly evolved to become herbivores
D. exchanged DNA at some point in the past