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Question

The four elements that make up an overwhelming majority of all compounds found in a living systems are-

A
H,O, C, N
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B
C, H, O, S
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C
C, H, O, P
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D
C, N, O, P
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Solution

The correct option is A H,O, C, N
Major bio-macromolecules (proteins, carbohydrates, lipids and nucleic acids) found in the body of all living organisms on Earth are made up mostly by chemically combining carbon, hydrogen, oxygen and nitrogen. It was hypothesized that these elements in living systems have been derived from the primitive atmosphere, which consisted of methane, water vapour, hydrogen and ammonia.

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