Atmospheric oxygen levels have remained constant at 21 percent for thousands of years.Scientists have speculated that low carbon dioxide levels in the atmosphere could be responsible for this steady O₂ level.Considering that the majority of plants on Earth are C₃ plants, explain how low carbon dioxide levels could have helped maintain constant oxygen levels on the planet.

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The Answer of Atmospheric oxygen levels have remained constant at 21 percent for thousands of years.Scientists have speculated that low carbon dioxide levels in the atmosphere could be responsible for this steady O₂ level.Considering that the majority of plants on Earth are C₃ plants, explain how low carbon dioxide levels could have helped maintain constant oxygen levels on the planet.

Atmospheric Oxygen Levels Have Remained Constant at 21 Percent for Thousands