<prompt> Exposure to ultraviolet light directly facilitates which of the following?Conversion of 7 dehydrocholesterol to 25-hydroxycholecalciferolConversion of 25-hydroxycholecalciferol to 1,25- dihydroxycholecalciferolTranspo of calcium into the extracellular fluidFormation of calcium-binding protein  <response>: Ultraviolet light absorbed by the skin directly facilitates conversion of cholesterol to 25-hydroxycholecalciferol. 