02: 20: 1
the chemical equation of photosynthesis includes 602. what does the small number after the represent?
the total atomic weight of the oxygen
the number of oxygen molecules produced
o the number of oxygen atoms in each oxygen molecule
the number of oxygen atoms needed to balance the equation
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The number of oxygen atoms in each oxygen molecule  

Explanation:

The subscript in 6O₂ represents the number of oxygen atoms in each oxygen molecule.

A is wrong. The subscript tells you nothing about the atomic weight of oxygen.

B is wrong. The 6 tells you how many molecules of O₂ are produced with each molecule of glucose.

D is wrong. The 6 tells you the number of oxygen atoms needed to balance the equation.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."