Photosynthesis and Cellular Respiration
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Autotrophic cells take in the free energy through photosynthesis and chemosynthesis. Photosynthesis traps free energy in the sunlight that is then used to produce carbohydrates from carbon dioxide. Chemosynthesis captures energy present in inorganic chemicals. Cellular respiration uses the free energy from sugars to produce free energy carriers, including ATP. The free energy available in sugars runs the metabolic pathways in cells. Photosynthesis and respiration are interdependent processes. Cells and organisms must exchange matter with the environment.