Frequency of bowel movements varies widely among individuals, as well as varying widely for any single individual. In studies on the subject, approximately 50 to 70 percent of people surveyed report having a single daily bowel movement. Outliers range from one movement every three days to three movements a day.
Cell theory was eventually formulated in 1839. This is usually credited to Matthias Schleiden and Theodor Schwann. However, many other scientists like Rudolf Virchow contributed to the theory. The three tenets to the cell theory are as described below: All living organisms are composed of one or more cells.
Matthias Schleiden helped to reject the theory of spontaneous generation by providing evidence of plants and how their organisms grew. Theodor Schwann Theodor Schwann discovered that plants are made up of cells using a microscope, which also supports the cell theory.ike Newton, the cell theory would not have been developed without the invention of the microscope. In order for Matthias Schleiden, Theodor Schwann, and Rudolf Virchow to create the cell theory, they needed the microscopes that Hans and Zacharias Jansen had invented prior to their discoveries.