What Advantage Does the Activity of Osteoblasts and Osteoclasts Impart

Multiple Choice

What advantage does the activity of osteoblasts and osteoclasts impart to vertebrates, even after growth has finished?

A) As old bones are dissolved, new bones can be formed.
B) The cells enable bone to lengthen and shorten as needed.
C) The cells allow bone to get stronger as physical demands are placed on it.
D) Bone growth never finishes; it continues at a slow pace throughout life.