Explanation:

Photosynthesis is the process plants use to produce oxygen and carbohydrates. Plants are both producers and consumers of oxygen and carbohydrates. The process is divided into two parts: the light-dependent reactions and the light-independent reactions. All of these reactions take place in a small structure in plant cells called chloroplasts. The light-dependent and light-independent reactions take place concurrently during the daytime.
Carbohydrates are essential for sustaining countless life forms on Earth, and carbon dioxide, CO2, is a necessary ingredient to make carbohydrates. Plants serve as factories for its production. If all plants and other photosynthesizing organisms died out, all animal life would die as well, as oxygen and food sources become depleted.