Pioneering work in the field of genetics began prior to the 20th century. However, much of the early work relied only up
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Pioneering work in the field of genetics began prior to the 20th century. However, much of the early work relied only up
Cell theory began to develop in 1839, following the research of Matthias Schleiden and Theodor Schwann into plant and animal tissues. Both the botanist Schleiden and the physiologist Schwann noticed that every organism they viewed under a microscope, whether plant or animal, was composed of cells. Their observations that all living species are made up of one or more cells led to the early formation of cell theory. Which tenet of cell theory is described by the paragraph about the historical observations of cells? All organisms are composed of one or more cells. The cell is the basic unit of every organism. All metabolism transpires within cells. All cells come from preexisting cells.