it's the basic unit of all living things, and all cells come from other cells
Theodor Schwann wrote the first two parts of the cell theory
Two scientists came up with The Cell Theory. It was in 1839, Matthias Schleidan and Theodor Schwann, two German Biologists came up with this theory.
Schleiden and Schwann
Credit for developing cell theory is usually given to three scientists: Theodor Schwann, Matthias Jakob Schleiden, and Rudolf Virchow. In 1839, Schwann and Schleiden suggested that cells were the basic unit of life. Their theory accepted the first two tenets of modern cell theory. However, the cell theory of Schleiden differed from modern cell theory in that it proposed a method of spontaneous crystallization that he called "free cell formation".
Cell theory is really important because it provided, and still provides one of the great unifying theories in biology: one that says in spite of all the vast diversity of organisms, they are are united at a very fundamental level, namely the presence of cells.
Cell theory cannot be changed to cell law because they are two different concepts. Cell theory is a collection of scientific principles that describe the basic properties of cells, while cell law does not exist as a recognized scientific concept.
The cell theory was given by three scientists: Matthias Schleiden, Theodor Schwann, and Rudolf Virchow. They proposed that all living organisms are composed of cells, cells are the basic unit of structure and function in living organisms, and new cells arise from pre-existing cells.
The two most important principles of democratic theory are popular sovereignty, which emphasizes that political power resides with the people, and political equality, which stresses that all individuals have an equal opportunity to participate in the decision-making process.
One reason a transport system is necessary in animals because they need to get rid of the extra waste. They also need a transport system to take in nutrients.
the cell theory and the microscope
The two main theories of hematopoiesis are the monophyletic theory, which suggests that all blood cells arise from a common stem cell, and the polyphyletic theory, which proposes that different blood cell lineages have separate origins. Recent evidence supports the monophyletic theory, where a single hematopoietic stem cell gives rise to all blood cell types through a hierarchical differentiation process.
Based on the timeline of the cell theory, father and son, Hans and Zacharias Janssen started produced the first compound microscope. They combined two convex lenses within a tube. This was in the year 1595.