Ordinary air contains about 21% of oxygen. However , when river water is boiled, over 25% of oxygen is released. The explanation for this is that
A. the oxygen gas is more soluble in water than nitrogen gas.
B. river water is cleaner than the air
C. the carbondioxide gas in the air pushes out the oxygen gas
D. the water cycle evaporates some of the oxygen.
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First put up one question then other one
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idk htatq but bro keep trying
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