Question

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 familys geographical origin provide evidence that all these animals—
a live in the same type of ecosystem
b have slowly evolved to become herbivores
c have a common ancestor
d exchanged dna at some point in the past
8 *
a
b
c
d

Explanation:

In biological taxonomy, sharing a family (Camelidae here) implies a common evolutionary origin. Physical traits (two toes, etc.) and geographical origin (North America) support a common ancestor. Option A is wrong as they might have dispersed. Option B: no info on herbivory. Option D: DNA exchange (horizontal gene transfer) is rare in mammals; common ancestry is via vertical inheritance.

Answer:

C. have a common ancestor