The answer is photosynthesis.
<span>Photosynthesis
occurs in the leaves of green plants. During photosynthesis, carbon
dioxide and water are converted into using the energy of
sunlight to glucose and oxygen. After great evolution of plants, the photosynthetic rate was increased. More plants mean more oxygen produced in the process of photosynthesis. Thus, photosynthesis </span><span> is most responsible for the increase in early Earth’s atmospheric oxygen levels.</span>
A Respiration by animals CO2 is being added.
B trees burning same
C tree leaves removed
D oil added
I think it's A. Tell me if I'm wrong.
Please leave a thanks.
Answer:
Increase
Explanation:
When there is enough food there is always excelling Reproduction
