The Major Source of Free Oxygen in the Atmosphere Is from?

Answer

Oxygen is present by default in our atmosphere. The majority of our oxygen comes from plants in the ecosystem. Without any plants, the oxygen would eventually run out.
Q&A Related to "The Major Source of Free Oxygen in the Atmosphere..."
Green Plants.
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The absence of free atmospheric oxygen results in an
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C plants, It's the O2, to CO2 exchange we have with plants. we give off CO2 plant with photosynthesis give off oxygen.
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In our atmosphere, plants still account for our oxygen; the rainforest is the largest supplier of O2.
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