Question

What is cell theory and who proposed it? What modification Virchow made to this theory

Answer 1

Cell Theory is one of the basic principles of biology. Credit for the formulation of this theory is given to German scientists Theodor Schwann, Matthias Schleiden, and Rudolph Virchow. The Cell Theory states: All living organisms are composed of cells. They may be unicellular or multicellular.rudolf virchow contributed to the theory that It was an important step in the movement away from 

Answer 2

Cell theory was proposed by Schleiden and Schwann in 1839. The theory was further extended by R. Virchow (1855). It states that:

1)All plants and animals are made up of cells.

2)Cell is the basic unit of life

3)All cells arise from pre-existing cells.