Photosynthesis is the process by which plants make their own nutrients from sunlight and carbon dioxide in the air. The plant cell has a nucleus and specific characteristics that differentiate it from the animal cell. These include chloroplasts containing chlorophyll, the most abundant pigment in leaves, which absorb light energy and carbon dioxide to produce sugars through photosynthesis. Chloroplasts develop in two stages: the first depends on the light received and releases oxygen and ionized hydrogen; the second fixes carbon dioxide as organic carbon, through the so-called Calvin cycle, and allows the plant to generate carbohydrates, fatty acids, and amino acids. This infographic from the Ábaco collection is part of the series The Secrets of Plants, also made up of those originally titled: Underground, Flowers, Seeds and Stems and Trunks.