Question

in order for the human body to make vitamin d, some exposure to what kind of light waves is necessary?
infrared waves
x rays
microwaves
ultraviolet waves

Explanation:

The human body can synthesize vitamin D when the skin is exposed to ultraviolet - B (UV - B) rays from sunlight. These rays interact with a precursor molecule in the skin to initiate the vitamin D synthesis process. Infrared waves are mainly related to heat, X - rays are used for imaging in medical and other applications and are high - energy and potentially harmful in excess, and microwaves are used for communication and heating in appliances like microwaves ovens. None of these contribute to vitamin D synthesis.

Answer:

D. Ultraviolet waves