This document discusses cellular metabolism, including photosynthesis and cellular respiration. Photosynthesis occurs in chloroplasts and uses carbon dioxide, water and energy from the sun to produce glucose and oxygen. Cellular respiration uses glucose and oxygen to produce energy in the form of ATP. Metabolism also includes anabolism, which builds complex molecules, and catabolism, which breaks down molecules to release energy. The cycling of molecules between chloroplasts and mitochondria transfers energy through living things. The document also describes the process of cell division, including the stages of mitosis and cytokinesis, which produces two daughter cells with identical DNA to the original parent cell.