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The subunit that makes up fat is called triglyceride.
atom
Amino acids
nucleotide = in a nucleic-acid chain, a subunit that consists of a sugar, a phosphate, and a nitrogenous base.
The subunit in a nucleic acid chain that consists of a sugar a phosphate and a nitrogenous base is a nucleotide.
The bell is a large unit, so a subunit, a decibel, is usually used. There is no subunit of decibel.