Who proposed the cell theory?

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(A) The cell theory was proposed by Matthias Schleiden and Theodor Schwann. In $1838$, Matthias Schleiden, a German botanist, examined a large number

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Schleiden and Schwann

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(A) 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, based on his studies on plant tissues, that the presence of a cell wall is a unique character of the plant cells. On the basis of this, Schwann proposed the hypothesis that the bodies of animals and plants are composed of cells and products of cells.

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