Question

which is one of the six fundamental elements that are found in living organisms? oxygen helium sodium chlorine

Explanation:

The six fundamental elements in living organisms are carbon (C), hydrogen (H), nitrogen (N), oxygen (O), phosphorus (P), and sulfur (S). Among the given options, oxygen is one of these six elements. Helium is a noble gas and not involved in the basic composition of living organisms. Sodium and chlorine are important for some physiological functions but are not among the six most fundamental elements that form the bulk of biological molecules (like carbohydrates, proteins, nucleic acids, and lipids).

Answer:

oxygen