1. Plants: This is the most well-known group. From towering trees to tiny mosses, all plants use sunlight, water, and carbon dioxide to produce their own food.
2. Algae: This diverse group includes seaweed, phytoplankton, and many single-celled organisms. They are essential for aquatic ecosystems, producing a significant portion of the Earth's oxygen.
3. Cyanobacteria: These are bacteria that are also known as blue-green algae. They were the first organisms on Earth to evolve photosynthesis and were crucial in transforming the planet's early atmosphere.
So, while there are many individual species within these groups, the three main groups of organisms that carry out photosynthesis are plants, algae, and cyanobacteria.
