A) include water, carbon, nitrogen, and phosphorus. B) benefit organisms if they are present but are not essential. C) are needed in smaller quantities than are macronutrients. D) are not naturally occurring and must be synthesized by scientists. E) are smaller molecules than are macronutrients. A) include water, carbon, nitrogen, and phosphorus. B) benefit organisms if they are present but are not essential. C) are needed in smaller quantities than are macronutrients. D) are not naturally occurring and must be synthesized by scientists. E) are smaller molecules than are macronutrients.