What are the three called?

(a) = Nitrogenous base (adenine)

(b) = Ribose sugar

(c) = Three phosphate groups

Explanation:

The structure depicted is that of ATP (adenosine triphosphate). Structure (a) is adenine, a nitrogenous base, structure (b) is a ribose sugar, and structure (c) is three phosphate groups. These three structures are present in every single ATP molecule.

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