The central lumens of thyroid follicles are filled with colloid, which consists of the a molecule that binds and stores thyroid hormone.

chemical because it warmed up which involves temperature and it bubbled which includes changing

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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.