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Cell theory refers to the idea that cells are the basic unit of structure in all living things. Development of this theory during the Mid 1600s was made possible by advances in microscopy. This theory is one of the foundations of Biology. The theory says that new cells are formed from other existing cells and the cell is a fundamental unit of structure, physiology, and organization in all living organisms. In chemistry and physics, atomic theory is a theory of the nature of matter, which states that matter is composed of discrete units called atoms. It began as a philosophical concept in ancient Greece and India and entered the scientific mainstream in the early 19th century when discoveries in the field of chemistry showed that matter did indeed behave as if it were made up particles.

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