As a final exam question in your biology course, you are asked to identify an animal that you immediately recognize as a chordate. your instructor applauds you for your quick recognition of the phylum, but then he asks you to be more specific. you reply that the animal that you are observing is a craniate. to get an a, you must also tell your instructor how you came up with your answer. what features would you use to formulate your answer?
check all that apply.
a. most craniates lack a functional jaw.
b. the anterior end of the nerve cord is elaborated to form a brain in craniates.
c. the brain is encased in a protective bony or cartilaginous housing in craniates.
d. adult craniates lose most of their chordate characteristics.
e. a group of embryonic cells called the neural crest form on either side of the neural tube in craniates.