Oxygen,carbon,hydrogen,and nitrogen are called the building-block elements because they make up the majority of the mass of the human body.

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These four elements, oxygen, carbon, hydrogen, and nitrogen, are considered the building blocks of life because they are the primary components of most organic molecules, including proteins, nucleic acids, carbohydrates, and lipids, which collectively constitute the majority of the human body's mass.

Oxygen,carbon,hydrogen,and Nitrogen Are Called the Building-Block Elements Because They Make