Biology

The correct answer is: B.A polymer composed of many amino acids.

Proteins are macromolecules made up of long chains of amino acids, which are linked together by peptide bonds. The sequence and structure of these amino acids determine the protein's specific function and properties in biological processes.

Now, let’s review the other options:

A.A polymer composed of many sugars: This describes polysaccharides (like starch or glycogen), which are made up of repeating units of sugar molecules (monosacch...