Vitamin D is necessary for __ increasing osteoclast activity. collagen formation. absorption and transport of calcium and phosphate ions in the small intestine. the formation of the organic framework of bone. reducing osteoblast activity.

Vitamin D is necessary for the absorption and transport of calcium and phosphate ions in the small intestine. It plays a crucial role in maintaining calcium and phosphate homeostasis in the body, which is essential for the development and maintenance of healthy bones and teeth. Vitamin D also has other important functions, such as regulating cell growth, immune function, and inflammation.