Question

Who proposed the cell theory and explained it? Also, name the scientist who expanded this theory.

Answer 1

All known organisms have a cell as their basic structural, functional, and biological unit. Because cells are the smallest units of life, they are frequently referred to as "building blocks of life." Cell biology, cellular biology, or cytology are all terms for the study of cells.

Complete answer:
Cell theory is the historic scientific theory that all living organisms are made up of cells, that cells are the basic structural or organizational unit of all organisms, and that all cells originate from pre-existing cells. One or more cells make up every living organism.
In 1855, Virchow expanded the cell theory by proposing that all cells originate from pre-existing cells. Cells are the structural and functional units of all animals and plants, and all cells originate from pre-existing cells. This is referred to as the Cell Theory. Matthias Schleiden and Theodor Schwann proposed it in 1839, and Rudolf Virchow added to it in 1858.
The first four statements of cell theory were:
-Cells are the building blocks of all living things.
-Pre-existing cells are used to create new cells.
-All of the cells are the same. Finally, cells are the most fundamental building blocks of life.
-In living things, cells are the basic units of functionality and structure.
Thus, Matthias Schleiden and Theodor Schwann proposed cell theory and Virchow expanded the cell theory.

Note: Animal tissues were studied after plants because the tissues were fragile and prone to tearing, making thin slices difficult to prepare for study. Biologists believed that life had a fundamental unit, but they couldn't figure out what it was. This fundamental unit would not be connected to cellular structure and the existence of cells in animals or plants.