* Plants: This is the most well-known group of photoautotrophs. All plants, from tiny mosses to giant trees, use photosynthesis to produce their food.
* Algae: Algae are a diverse group of organisms that live in water, and they play a major role in producing oxygen for the atmosphere. They include everything from microscopic diatoms to giant kelp.
* Cyanobacteria: These are bacteria that contain chlorophyll and can perform photosynthesis. They are often found in aquatic environments and are responsible for much of the oxygen production on Earth.
It's important to note that not all organisms use photosynthesis. For example, animals, fungi, and some bacteria are heterotrophs, which means they obtain their energy from consuming other organisms.
