================================
[tex] \large \sf \underline{Question:}[/tex]
================================
[tex] \large \sf \underline{Answer:}[/tex]
[tex] \qquad \quad \huge \bold{Cell \: Theory}[/tex]
================================
[tex] \large \sf \underline{Explanation:}[/tex]
The idea that cells are the basic structural and functional units of life is an example of a scientific Cell Theory.
The Cell Theory was proposed by three German scientists called Theodore Schwan, Rudolf Virchow, and Mathios Schleiden.
For More Information :
================================