Respuesta :
We get our oxygen essentially from plants (algae, tress, etc) and O^2 is a by product of photosynthesis so the answer is true.
Answer: True
Explanation:
It is true that the the process of photosynthesis is important for the maintaining the level of both the gases in the atmosphere.
When the process of photosynthesis starts carbon dioxide and water is used by the plants to produce glucose and oxygen.
This is how the level of carbon dioxide and oxygen is maintained on earth. There is no other process on earth which releases oxygen into the environment.
