Question Detail
Question
Most common and biologically important elements are H, O, N & C.
Correct Answer
Option A is the correct answer.
Detailed Explanation
This statement is true. Hydrogen (H), Oxygen (O), Nitrogen (N), and Carbon (C) are the four most abundant elements in living organisms. They make up about 96% of the human body's mass and are the fundamental building blocks of all major organic molecules like carbohydrates, lipids, proteins, and nucleic acids.
Hint
These four elements are the key ingredients for building organic molecules.