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. exchanged DNA at some point in the past
B. have slowly evolved to become herbivores
C. live in the same type of ecosystem
D. have a common ancestor