The cell theory consists of three fundamental principles:
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All living organisms are composed of one or more cells: This principle states that all forms of life, from single-celled organisms like bacteria to complex multicellular organisms like humans, are made up of cells.
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The cell is the basic unit of life: Cells are the smallest units that can carry out all the processes necessary for life. This means that all functions of living organisms occur at the cellular level.
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All cells arise from pre-existing cells: This principle emphasizes that new cells are produced by the division of existing cells. This process ensures continuity of life and the transmission of genetic material.
These three tenets collectively emphasize the importance of cells in the biological sciences and the continuity of life across generations.