Cartilage is a rubber like tissue, protects the ends of long bones at the joints component of the rib cage, the ear, the nose and the bronchial tubes
What property makes the normal pacemaker region of the heart function as a pacemaker?
The property of the normal pacemaker region is able to provide a normal setting for the heart to beat. It allows the heart to beat at a regular rate.
Pretty confident that it is A, judging by that the word composition is used as a combination or a ratio of 2 things. Also none of the other options make sense.
