Here's why:

* Photosynthesis is the process where plants use sunlight, water, and carbon dioxide to create their own food (glucose) and release oxygen as a byproduct.

* No other organisms on Earth can perform photosynthesis in the same way that plants do.

While some other organisms, like certain bacteria, can also perform photosynthesis, they do it differently and don't have the same complex structures that plants use (like chloroplasts).