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This commercially available non-toxic gas makes up 25% of the Suns mass.
Question 1:
This commercially available non-toxic gas makes up 25% of the Suns mass. It is used in deep diving to reduce the effects of narcosis.
A.
nitrogen
B.
hydrogen
C.
helium
D.
carbon
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Trivial Practice Quiz science-technology - Test 94 | Englishfreetest.com
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15 questions
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Some questions from the same exam
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