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Biomolecules (Zoology)

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  1. The four elements making 99% of living system are
    1. C, H, O, S
    2. C, H, O, P
    3. C, H, O, N
    4. C, N, O, P
Correct Option: C

Principal or major elements include oxygen, carbon, hydrogen and nitrogen. They are so named because they alone constitute 99% of living system.


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