Which Statement About Skeletons Is True

Multiple Choice

Which statement about skeletons is true?

A) No skeleton consists entirely of cartilage.
B) Hydrostatic skeletons are not useful in the function of locomotion.
C) An advantage of an exoskeleton is that it can continue to grow throughout the life of the animal.
D) Unlike bones, external skeletons must remain flexible and therefore do not contain calcium carbonate crystals.
E) The two categories of bone are membranous bone and cartilage bone, based on how the bones are formed.