Sarah is a pediatric allergist, Nicole is an osteoimmunologist, and Donald is a pharmacologist. What do these three health professionals have in common?
They all work with children.
They all must take board exams to be certified every ten years.
They all develop and test medicines to be used in the various healthcare fields.
They all had to pass the MCAT at one point in their career paths.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

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.