Complete the statement below.(1 point)

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 

answer choices:

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

have a common ancestor