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9 January, 15:42

What percentage do the elements hydrogen and helium account for in the universe? A. 100% B. 99.9% C. 98% D. 99.8%

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  1. 9 January, 16:11
    0
    C. 98% this worlds atmostphere is mostly nitrogen tho
  2. 9 January, 17:05
    0
    The percentage is 99.8% so D
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