It has three tenets: 1. Living organisms are made up of cells. 2. Cells are the basic structural/organizational unit of all organisms. 3. All cells come from pre-existing cells. All of the above statements are supported by the cell theory.
In 1839, Theodor Schwann proposed the classical cell theory. This theory is made up of three parts. The first part says that cells are the building blocks of all organisms. The second section states that cells are life's fundamental units. After comparing their observations of plant and animal cells, Schwann and Matthias Schleiden arrived at the conclusion that served as the foundation for these pieces in 1838. In 1858, Rudolf Virchow wrote Omnis cellula e cellula, which means "all cells come from other cells," to describe the third section, which states that cells originate from pre-existing cells that have multiplied.
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