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In the 1930s C.B. van Niel correctly hypothesized that oxygen atoms in the oxygen gas released by plants come from

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In the 1930s C.B. van Niel correctly hypothesized that oxygen atoms in the oxygen gas released by plants come from
A. `H_(2)O`
B. `CO_(2)`
C. `C_(6)H_(12)O_(6)`
D. `O_(3)`
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Correct Answer - A
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