Delta Waves are the strongest during deep sleep. These waves are important for brain health because they encourage the movement of cerebrospinal fluid around the brain to?

yo

one part of the electromagnetic spectrum that arrives on earth as solar radiation from the sun is the visible spectrum. wavelengths of the visible spectrum combine to form what we refer to as

answer - d) ultraviolet radiation.

violet /   380–450 nm / 668–789 thz

violet is number 1 in the chart of visible light.