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This two-part program explains the basic physical and chemical processes that allow energy to be stored and utilized by living things. The physical concepts of matter and energy are explained and the structure of atoms are described. Students learn how sub-atomic particles aggregate to form elements and then combine to form molecules and chemical compounds. Finally, some of the most important compounds essential to living organisms are discussed. The second part utilizes the physical and chemical concepts to analyze two metabolic processes: aerobic cellular respiration and photosynthesis.