Answer:
UV radiation: Ultraviolet radiation. Invisible rays that are part of the energy that comes from the sun, can burn the skin, and cause skin cancer. UV radiation is made up of three types of rays -- ultraviolet A (UVA), ultraviolet B (UVB), and ultraviolet C (UVC).
Explanation:
It was not until the year of 1952!
D would be the answer to this question
A hypothesis can become A. a scientific theory if it is supported by repeated experimentation.
