Question

which of these nutrients can be found in all organic compounds?
nitrogen
calcium
carbon
phosphorous

Explanation:

Organic compounds are defined as compounds that contain carbon atoms (along with hydrogen, and often other elements like oxygen, nitrogen, etc.). By definition, all organic compounds must contain carbon. Nitrogen, calcium, and phosphorus are not present in all organic compounds (e.g., simple hydrocarbons like methane, \(CH_4\), have no nitrogen, calcium, or phosphorus).

Answer:

carbon