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a
Theodore Schwann, 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.
b
Schwann, a zoologist studied different types of animal cells and reported that cells had a thin outer layer which is today known as the ‘plasma membrane’.
c
Schwann proposed the hypothesis that the bodies of animals and plants are composed of cells and products of cells.
d
Schleiden and Schwann together formulated the cell theory.
answer is A.
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