How does the name carbohydrate indicate the chemical composition of this class of macromolecules?

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The name "carbohydrate" gives away the primary components of it's chemical makeup.  "Carbo-" would indicate the presence of the element carbon, while "-hydrate" is a form of water, which has the elements hydrogen and oxygen.  Therefore, a carbohydrate is a class of macromolecule that has as it's chemical makeup the elements carbon, hydrogen, and oxygen.  A good example of a carboyhydrate is the simple sugar glucose, C6H12O6 (subscripts).  Carbohydrates take the form, in the human diet, as complex sugars and simple sugars.  When consumed, the digestive system's primary function is to reduce the complex sugars to simple sugars like glucose, which is readily absorbed into the blood stream.

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