Cell theory

Cell Theory provided a fundamental understanding that all living organisms are composed of cells, which are the basic unit of life. This theory also proposed that new cells could only arise from the division of existing cells, reinforcing the concept of cells as a fundamental unit of biological structure and function.
 Matthias Schleiden and Theodor Ambrose Hubert Schwann Germany 1838 Cell theory

Cell Theory provided a fundamental understanding that all living organisms are composed of cells, which are the basic unit of life. This theory also proposed that new cells could only arise from the division of existing cells, reinforcing the concept of cells as a fundamental unit of biological structure and function.