A C3 plant is a plant that utilizes the C3 carbon fixation method to convert carbon dioxide into an organic compound. The carbon is first fixed into 3-carbon atoms before entering the Calvin Cycle. C3 plants only use the Calvin Cycle to fix their carbon dioxide. In the first steps of the cycle, two 3-carbon molecules of 3-phosphoglyceric acid (3-PGA) are made. This is the origin of its name, C3 plant. Around 85% of all plants in the world are C3 plants. These plants have a disadvantage in hot, dry condition due to a process of photorespiration which makes the plant fix oxygen instead of carbon.