Mitosis is a process of cell division that occurs in eukaryotic cells, leading to the formation of two daughter cells with identical genetic material. Among the options provided:
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Zooplankton: Eukaryotic organisms that can undergo mitosis.
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Phytoplankton: Eukaryotic organisms that can also undergo mitosis.
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Protozoans: These are also eukaryotic and undergo mitosis.
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Bacteria: These are prokaryotic organisms and do not undergo mitosis. Instead, they typically reproduce asexually through binary fission.
Therefore, the correct answer is bacteria.