Name the authors of the cellular theory and state its positions. Why has it been almost 200 years since the discovery of the cell

Name the authors of the cellular theory and state its positions. Why has it been almost 200 years since the discovery of the cell to the establishment of the cellular theory? What are the main points of modern cell theory?

In a generalized form, the cellular theory was formulated by the end of the 30s. XIX century Its creators were German scientists, the zoologist Theodor Schwann and the botanist Matthias Schleiden,
– all organisms are composed of cells;
– cells are the smallest structural units of life;
– cells arise through neoplasms from non-cellular matter.
Particularly intensively, the cell began to be studied in the 19th century, which was associated with the improvement of the microscope. The cellular level of research has become the leading principle of biological sciences, the basis for understanding the organization of living things.
The main provisions of modern cellular theory
1. A cell is a structurally functional unit of the living, representing an elementary living system. It is characterized by all the signs of the living.
2. Cells of different organisms have a similar chemical composition and structural plan.
3. A new cell results from the division of the original cell.
4. Multicellular organisms develop from one source cell.
5. The similarity of the cellular structure of organisms indicates the unity of their origin

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