Proteins, carbohydrates, and nucleic acids are all polymers. what repeating subunit is each made of?

Amino acids. These class of compounds are considered the building blocks of most organisms, and around 500 of these are known and indentified. All proteins, carbohydrates, and nucleic acids are polymers ("many units") and each unit is an amino acid. 

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explanation:

i think the answer is

mass