Which of the following repeating units make up a protein? . fatty acids. peptide acids. amino acids. carboxylic acids

Amino acids.  

i got this from google
Proteins are polymers of amino acids joined together by peptide bonds. There are 20 different amino acids that make up essentially all proteins on earth. Each of these amino acids has a fundamental design composed of a central carbon (also called the alpha carbon) bonded to: a hydrogen

Amino acids is the one among the following options that is a repeating unit making up a protein. The correct option among all the options that are given in the question is the third option. here are around 20 kind of amino acids that make all the proteins present on our earth. I hope that the answer has come to your help.