The cell theory states that,.........

The study of cells has been greatly advanced by the use of an electron microscope. This is primarily because:

Who discovered that the cell is the basic unit of life?

According to the Cell Theory,which statement is true regarding cell structure?

Select the correct match for $X$ and $Y$:

Column $X$	Column $Y$
$(1)$ Robert Brown	$(P)$ Final shape of cell theory
$(2)$ Virchow	$(Q)$ Bacterial staining method
$(3)$ Gram	$(R)$ Unit membrane concept
$(4)$ Robertson	$(S)$ Discovery of nucleus

Select the statements which are related to Schwann.
$(i)$ He reported that cells have a thin outer layer which is today known as plasma membrane.
$(ii)$ Cell wall is a unique character of the plant cell.
$(iii)$ Body of plants and animals are composed of cells and products of cells.