Who are the proponents of the Cell Theory?

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(B) The Cell Theory was proposed by Matthias Schleiden and Theodor Schwann. In $1838$,Matthias Schleiden,a German botanist,examined a large number of

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Schleiden and Schwann

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(B) The Cell Theory was proposed by Matthias Schleiden and Theodor Schwann. In $1838$,Matthias Schleiden,a German botanist,examined a large number of plants and observed that all plants are composed of different kinds of cells which form the tissues of the plant. At about the same time,in $1839$,Theodor Schwann,a British zoologist,studied different types of animal cells and reported that cells had a thin outer layer which is today known as the 'plasma membrane'. He also concluded that the presence of a cell wall is a unique character of plant cells. On the basis of this,Schleiden and Schwann together formulated the Cell Theory.

Column-$I$	Column-$II$
$A$. Leeuwenhoek	$I$. First saw and described a living cell
$B$. Robert Brown	$II$. Presence of cell wall is unique to plant cells
$C$. Schleiden	$III$. Discovered the nucleus
$D$. Schwann	$IV$. All plants are composed of different kind of cells

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