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Formation of new cells from pre-existing cells was first explained by Robert Brown.

Nucleoplasm is the main arena of cellular activities in both plant and animal cells.

A cell is kept in living state due to the chemical reactions in cytoplasm.

Prokaryotes have both 70S and 80S type of ribosomes

answer is C.

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Detailed Solution

Prokaryotes have only 70S type of ribosomes. It is cytoplasm but not nucleoplasm which is main arena of cellular activities. Rudolf Virchow explained that new cells are formed from pre-existing cells.

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