What gas is actually a waste product of photosynthesis?

What gas is actually a waste product of photosynthesis?

Correct Answer: oxygen
nitrogen
carbon dioxide
hydrogen

Explanation: Around 3 billion years ago, photosynthesis began. Organisms could make their own food from sunlight and inorganic molecules. From these ingredients they made chemical energy that they used. Oxygen is a waste product of photosynthesis. That first oxygen combined with iron to create iron oxide. Later on, the oxygen entered the atmosphere.

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