Question

which element is found in both dna and protein?
sulfur
sodium
nitrogen
chlorine

Explanation:

DNA is composed of elements such as carbon, hydrogen, oxygen, nitrogen, and phosphorus. Proteins are made up of carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. Sulfur is not in DNA, sodium and chlorine are not common in either DNA or protein's core composition. Nitrogen is present in both DNA (in its nitrogen - containing bases) and protein (in amino groups of amino acids).

Answer:

nitrogen