atom, basic building block of matter, molecules, a group of atims joined together in a certain way, amino acids, molecules that are the building blocks of proteins, cellular respiration, The process cells use to turn food into energy, energy, the ability to make things move or change, carbon dioxide, a molecule of carbon and oxygen, glucose, a simple sugar that cells use for energy, chemical reactions, a process in which atoms rearrange to form a new substance, cells, the basic building blocks of ALL living things, circulatory system, body system that moves molecules to and from all cells in the body, digestive system, body system that takes in food and breaks it down, respiratory system, body system that takes in oxygen and releases carbon dioxide, starch, an energy storing molecule, metabolism, the body's use of molecules for energy and growth, system, a set of smaller parts that make up a larger whole

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