Question

which elements are common to all organisms? check all that apply.
sodium
oxygen
sulfur
hydrogen
iron
phosphorus

Explanation:

All organisms are composed of biomolecules (carbohydrates, lipids, proteins, nucleic acids). Oxygen, hydrogen, and phosphorus are essential: oxygen and hydrogen are in water and all biomolecules; phosphorus is in nucleic acids (DNA/RNA) and ATP, critical for all life. Sodium, sulfur, and iron are not universal (e.g., some microbes lack sodium-dependent processes).

Answer:

oxygen, hydrogen, phosphorus