Who are the two biologists that presented the cell theory?

The cell theory, which states that all living organisms are composed of one or more cells and that the cell is the basic unit of life, was proposed by Matthias Jakob Schleiden and Theodor Schwann in the mid-19th century. Schleiden, a German botanist, first proposed the idea that plants are composed of cells in 1838, while Schwann, a German physiologist, independently proposed the same for animals in 1839. Together, they formulated the cell theory, which revolutionized the field of biology and remains one of the fundamental principles of modern biology. Although Robert Hooke, Antonie van Leeuwenhoek, and Robert Brown made significant contributions to the study of cells, they did not present the cell theory.