Refer to the diagram below. The Ruben and Kamen experiments tracing isotopes of oxygen through the process of photosynthesis proved that 
A) all the oxygen gas produced during photosynthesis comes from water.
B) CO2 is the source of the oxygen released during photosynthesis.
C) the oxygen released by water is incorporated into glucose.
D) oxygen is needed to made rubisco.
E) NADPH is made during the Calvin cycle.
Correct Answer:
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