"Raising and lowering the heels, leaning slightly forward with feet approximately shoulder width apart" is the one among the following choices given in the question that <span>is an example of moving properly for calf raises. The correct option among all the options that are given in the question is the last option or option "D".</span>
The answer to this question would be: vitamin D
The UV is needed by the skin to make previtamin D3. Previtamin D3 or cholecalciferol made from the skin will be changed in the liver into 25- hydroxyvitamin D3 and then sent to the kidney to be changed into 1,25- dihydroxyvitamin D3. The last change in the kidney will active the vitamin D. Vitamin D has a role in the calcium absorption which was will strengthen the bone tissue.
