Although Snakes and Dogs Are Different Species,they Both Have a Bony

Multiple Choice

Although snakes and dogs are different species,they both have a bony vertebral column surrounding and protecting the nerve cord running down the center of their back.This column of bone is an example of a ________ trait and evidence of snakes and dogs sharing a common ________.

A) analogous; descent
B) vestigial; ancestor
C) homologous; ancestor
D) vestigial; descent