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B
Albrecht von Roelliker
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C
Hooke
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D
Haeckel
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Solution
The correct option is A Schleiden and Schwann
Cell theory was postulated by Theodor Schwann and Matthias Schleiden in 1838. It includes the following points-
All living organisms are composed of one or more cells.
The cell is the most basic unit of life. The third was added by Rudolf Virchow in 1855, that stated "Omnis cellula e cellula" which means all cells arise only from pre-existing cells.