When the human body is under prolonged stress, the hormone cortisol is released into the blood. Unfortunately, cortisol also suppresses the production of white blood cells. Select all of the systems that are working together. digestive
endocrine
excretory
immune
circulatory
muscular
nervous
reproductive
respiratory
skeletal

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.

the answer is definitely a