The organisms that complete photosynthesis are called photoautotrophs. These organisms use sunlight, carbon dioxide, and water to produce their own food (glucose) and oxygen as a byproduct.

Here are some examples of photoautotrophs:

* Plants: The most familiar group of photoautotrophs. They use chlorophyll in their leaves to capture sunlight energy.

* Algae: A diverse group of aquatic organisms, ranging from microscopic single-celled organisms to large seaweeds. They use chlorophyll and other pigments to capture light.

* Cyanobacteria: These are photosynthetic bacteria that play a crucial role in the Earth's oxygen production. They contain chlorophyll and can live in a variety of environments, including water, soil, and even extreme environments like hot springs.

While most photoautotrophs are plants, algae, and cyanobacteria, some other organisms can also photosynthesize, including:

* Some protists: Certain protists like Euglena are capable of photosynthesis.

* Some bacteria: While cyanobacteria are the most prominent photosynthetic bacteria, some other bacterial groups also perform photosynthesis.

It's important to note that not all plants are photoautotrophs. Some plants are parasitic and rely on other organisms for their food.