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The oxygen that keeps us alive is product of photosynthesis. It comes from

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a
Carbon dioxide
b
Carbonates absorbed from soil
c
Oxides of mineral elements
d
Water

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detailed solution

Correct option is D

The oxygen comes from water. The water molecules are split at the “beginning” of photosynthesis for the electrons. These electrons eventually make their way to the electron transport chain, where oxygen is the final electron accept, and then released into the air.

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