If there were fewer plants to carry out photosynthesis, what change could it bring to the environment?

A. It would have more oxygen.

B. It would have more glucose.

C. It would have more ATP energy.

D. It would have more carbon dioxide.

The equation for the process of photosynthesis is:

Carbon dioxide + Water = Glucose + Oxygen

Hence,

Fewer plants can bring a huge change in the environment resulting in less oxygen and more carbon dioxide.

D. It would have more carbon dioxide.