Briefly give the contributions of the following scientists

Rudolf Virchow’s modern theory of cell is the cell divides and new cells are formed from the [pre-existing cells. He modified the hypothesis of Schleiden and Schwann

to give the cell theory to its final.

1. All living organism is composed of cells and products of cells

2. All cells arise from pre-existing cells

In 1839, a British Zoologist Theodore Schwann studied a different type of animal cells and said that cell had a thin layer later known as the plasma membrane. He

studied on plant cells and concluded that the presence of cell wall is a unique character of the plant cells.