A) striated and operate independently of other cardiac cells. B) smooth and under voluntary control. C) striated and under voluntary control. D) striated and interconnected by intercalated discs. E) smooth and under involuntary control.
An endoskeleton is the primary body support for which type of animal?
A) insects, including beetles B) annelids, including earthworms C) crustaceans, including lobsters D) cartilaginous fishes, including sharks E) bivalves, including clams