That is a great question, and it drives us to think about how organisms are connected in an ecosystem. The short answer is, photosynthesis can both directly and indirectly affect living organisms.

Photosynthesis uses energy from the sun, carbon dioxide, and water to produce chemical energy (in the form of sugar) and oxygen.

Plants are directly affected by photosynthesis because, through the process of photosynthesis, they produce chemical energy required to grow and thrive. But, what happens when an organism, like a deer, comes and eats the plant? The deer is indirectly affected by photosynthesis because it gets chemical energy from the plant (which was originally produced from photosynthesis).

In addition to chemical energy, photosynthesis produces oxygen, which is used by many other organisms. Using these examples, we can understand the importance of photosynthesis and how this process is connected, both directly and indirectly, to all living organisms.