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.
Igneous rock, because it is the cooling of hot magma.
Answer: oxygen and sugar molecules
Explanation: During cellular respiration, cells produce energy through the breakdown of sugar molecules in the presence of oxygen. Cellular respiration is a process by which glucose is broken down in the presence of oxygen to produce energy, carbon dioxide and water. The energy produced in cellular respiration is used to drive other cellular processes.
The equation for cellular respiration is C6H12O6 + 6O2 --> 6CO2 + 6H2O + Energy.
