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B
Robert Hooke
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C
Antonie Philips van Leeuwenhoek
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D
Theodor Schwann
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Solution
The correct option is A Robert Brown
Robert Hooke was the first to use the word 'cell' to describe a basic unit of life.
Antonie van Leeuwenhoek developed microscope.
Theodor Schwann proposed the cell theory
Antonie Philips van Leeuwenhoek (October 24, 1632 - August 30, 1723) who was a Dutch scientist first observed the cell nucleus, however, Robert Brown was a Scottish botanist who observed it in 1833, and gave it the name cell nucleus.