What were the 3 generalization Theodor Schwann proposed concerning the nature of cells?

Theodor Schwann proposed three key generalizations, collectively known as the cell theory. First, he asserted that all living organisms are composed of one or more cells. Second, he emphasized that the cell is the basic unit of structure and function in living things. Lastly, Schwann stated that all cells arise from pre-existing cells, underscoring the continuity of life through cellular division.