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B
Hooke
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C
Leeuwenhoek
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D
Brown
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Solution
The correct option is A Virchow
Robert Hooke observed “honeycomb-like structures” in cork cells under the self-designed microscope. He called the hollow shells. A German biologist Rudolph Virchow observed that all living cells arise from pre-existing cells ('omnis-cellula e cellula') which were added to the cell theory as a doctrine. The term “cell nucleus” was used the first time by Robert Brown. Leeuwenhoek formed a single lensed microscope to observe the tiny organisms which were then named as microorganisms. Thus, the correct answer is option A.