Which Statement About Skeletons Is True

Multiple Choice

Which statement about skeletons is true?

A) They can consist of mostly cartilage.
B) Hydrostatic skeletons cannot be used for locomotion.
C) An advantage of exoskeletons is that they can continue to grow throughout the life of the animal.
D) External skeletons must remain flexible, so they never include calcium carbonate crystals, as bones do.
E) Internal skeletons consist of four different types of bone: compact, cancellous, membranous, and Haversian.