Photosynthesis is performed by a wide range of organisms, primarily those that fall under the category of photoautotrophs. These are organisms that can produce their own food using light energy, water, and carbon dioxide. Here's a breakdown:

1. Plants: This is the most well-known group of photosynthetic organisms. From tiny mosses to towering trees, plants use photosynthesis to create sugars for energy and growth.

2. Algae: These are a diverse group of aquatic organisms, ranging from single-celled diatoms to large kelp forests. Algae are responsible for a significant portion of the Earth's oxygen production.

3. Cyanobacteria: These are single-celled prokaryotes that are often called "blue-green algae." They are incredibly important in the global carbon cycle and were responsible for the initial oxygenation of Earth's atmosphere billions of years ago.

4. Some Protists: Certain protists, like Euglena, are capable of photosynthesis, showcasing the diversity of this process.

5. A few Bacteria: While not as common as in other groups, some bacteria have adapted to use photosynthesis, particularly in extreme environments.

Key takeaway: Photosynthesis is not limited to a single type of organism. It's a vital process carried out by a diverse group of organisms, playing a crucial role in maintaining life on Earth.