Question

what are the bodys two sources of cholecalciferol (vitamin d₃)? (figure 5-10)
sunlight and water
air and sunlight
air and water
sunlight and food
air and food

Explanation:

The body can synthesize cholecalciferol (vitamin D3) when the skin is exposed to sunlight. It can also obtain it from dietary sources, such as fatty - fish, egg yolks, etc. Air, water are not sources of vitamin D3.

Answer:

sunlight and food