Research suggests that deficiency of vitamin d may lead to:

Phospholipids are arranged to form the plasma membrane so that a. the heads are facing the extra cellular fluid and tails are internal b. the heads of the outer layer phospholipids face the tails of the inner layer c. the tails of the outer layer phospholipids face the heads of the inner layer d. the heads of the internal and the tails are facing the extra cellular and intracellular fluid