Question

90% of the human body is composed of just four elements which are

a) Oxygen, Carbon, Hydrogen, Nitrogen
b) Sodium, Potassium, Chlorine, Calcium
c) Iron, Magnesium, Zinc, Copper
d) Phosphorus, Sulfur, Fluorine, Silicon

Answer 1

The four elements that compose 90% of the human body are Oxygen, Carbon, Hydrogen, and Nitrogen, which are fundamental for forming biological molecules.

Step-by-step explanation:

The question asks which four elements compose 90% of the human body. The correct answer is Oxygen, Carbon, Hydrogen, and Nitrogen. These are the major elements found in large quantities in the human body and are essential for life. They form the nucleic acids, proteins, carbohydrates, and lipids that are the fundamental components of living matter. In particular, Oxygen is critical for cellular respiration, Carbon is the backbone of all organic molecules, Hydrogen is involved in the chemical bonds that hold molecules together, and Nitrogen is a key component of amino acids and nucleic acids.