Which are characteristics of the integumentary system? Select two options. Skin's outer layer has living cells.
Hair helps regulate temperature.
Oil glands produce sweat and oil.
Nails protect nerves.
Hair stays on the head for two months.

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.