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A subdiscipline of Biology is physiology which examines the physical and chemical functions of the tissues, organs, and organ systems of an organism. Looking for help? Select a tutor today. Cell theory states that the cell is the fundamental unit of life, and that all living things are composed of one or more cells or the secreted products of those cells (e.g. shells). All cells arise from other cells through cell division. In multicellular organisms, every cell in the organism's body derives ultimately from a single cell in a fertilized egg. The cell is also considered to be the basic unit in many pathological processes. Need help? Select a tutor now. Your Biology tutor is ready and waiting. Select a tutor today.
