Question

The levels of Oxygen and Carbon dioxide are maintained constant in
the atmosphere
a. Due to respiration by animals
b. Due to photosynthesis by plants
4. Due to the processes of respiration and photosynthesis
d. Due to decrease in plant population​

Answer 1

Answer:

option 4 is correct

hope it helps

Answer 2

Answer:

4 due to the process of respiration and photosynthesis