Question

which of the following is one of the five most common elements associated with organic molecules?

• potassium
• mercury
• nitrogen
• sodium

Explanation:

The five most common elements in organic molecules are carbon, hydrogen, oxygen, nitrogen, and phosphorus (or sulfur in some contexts). Among the options, potassium, mercury, and sodium are not among these common elements for organic molecules, while nitrogen is.

Answer:

C. nitrogen