Which statement is false? (Multiple Choice)

Which statement is false?
  a. Calcium is the most important mineral involved with bone tissue turnover.
  b. Osteoblasts and osteoclasts are involved with the reabsorption and repair of bones.
  c. Bone mass decreases with age.
  d. Males have greater problems with loss of bone tissue than females do.
  e. Marrow fills the cavities in the spaces of the spongy bone and in the center of the shaft of
  the bone almost as quickly as the spaces are formed.

Question 2

Osteoporosis is a condition characterized by
  a. excessive build up of bone calcium deposits.
  b. hardening of the arteries in the bone.
  c. loss of bone mass.
  d. excessive rigidity of some bones.
  e. curvature of the spine.