Protoplasm is made up mainly of

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(A) Protoplasm is the living content of a cell. It is primarily composed of four major elements: $Oxygen$ $(O)$, $Carbon$ $(C)$, $Hydrogen$ $(H)$, and

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Oxygen, carbon, hydrogen and nitrogen

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(A) Protoplasm is the living content of a cell. It is primarily composed of four major elements: $Oxygen$ $(O)$, $Carbon$ $(C)$, $Hydrogen$ $(H)$, and $Nitrogen$ $(N)$. These elements together constitute about $95-99\%$ of the total mass of the protoplasm, forming the basis of organic molecules like proteins, carbohydrates, lipids, and nucleic acids.

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