Question

which four elements are found in every protein? some proteins contain additional elements. sulfur phosphorus nitrogen carbon hydrogen oxygen

Explanation:

Proteins are macromolecules composed of amino - acids. All amino - acids contain carbon, hydrogen, oxygen, and nitrogen as their fundamental elements. While sulfur and phosphorus can be present in some proteins, they are not found in every protein.

Answer:

C. nitrogen, D. carbon, E. hydrogen, F. oxygen