Cell theory was given by

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(B) The cell theory was formulated by $M.J. Schleiden$ and $Theodor Schwann$ in $1838$ and $1839$, respectively.$M.J. Schleiden$, a German botanist, o

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Schleiden and Schwann

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(B) The cell theory was formulated by $M.J. Schleiden$ and $Theodor Schwann$ in $1838$ and $1839$, respectively.$M.J. Schleiden$, a German botanist, observed that all plants are composed of different kinds of cells which form the tissues of the plant.$Theodor Schwann$, a British zoologist, reported that cells had a thin outer layer which is today known as the '$plasma membrane$'.Together, they proposed the cell theory, which states that all living organisms are composed of cells and products of cells.

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