Nitrogen is an essential component of:Multiple ChoiceAmino acids and proteinsOrganic moleculesSugars, the product of photosynthesisThe hydrologic cycle

Nitrogen is an essential component of:

1. Amino acids and proteins: Yes, nitrogen is a key element in amino acids, which are the building blocks of proteins.

2. Organic molecules: Yes, nitrogen is a part of many types of organic molecules, not just proteins but also nucleic acids like DNA and RNA.

3. Sugars, the product of photosynthesis: No, sugars produced by photosynthesis primarily contain carbon, hydrogen, and oxygen. Nitrogen is not a main component.

4. The hydrologic cycle: No, the hydrologic cycle refers to the circulation of water within the Earth's hydrosphere. It involves processes like evaporation, condensation, precipitation, and runoff. Nitrogen does not play a direct role in this cycle.

So, the correct answers are Amino acids and proteins, and Organic molecules.