Answer:
The interdependence of photosynthesis and cellular respiration is that photosynthesis utilizes the carbon dioxide that is produced by cellular respiration.
Photosynthesis also releases oxygen into the environment which is used in the process of cellular respiration.
If a number of photosynthetic organism is removed from the environment then the concentration of carbon dioxide in the environment will increase as there will be no organism that will utilize the carbon dioxide present in the environment.