The molecule in this pizza is a "protein" because it is already mentioned and cleared from the question that it is a polymer, hydrophilic, and it's made up of oxygen, hydrogen, and sulfur atoms.
Explanation :
Amino acid is a simple term defined as an organic chemical compound that comprises of an acidic carboxyl group (COOH), a basic amino group (NH_2NH2).
It is unique chain group.
Protein : The hydrophilic, macromolecule (polymer) that is made as a result of the unison of the chain of the many amino acids is known as Protein.
Protein normally comprises of various elements such as Oxygen (O2), Hydrogen (H2), Sulphur atoms.
Hence, it is pretty much clear from the above explanation that molecule in a pizza that is a polymer, has O2, H2 and Sulphur atoms and that is also hydrophilic is a molecule of "Protein".
To know more about Protein here :
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