Well-defined nucleus is absent in

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(A) well-defined nucleus is a characteristic feature of eukaryotic cells.Blue-green algae (also known as Cyanobacteria) are prokaryotic organisms.Prok

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Blue-green algae

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(A) well-defined nucleus is a characteristic feature of eukaryotic cells.Blue-green algae (also known as Cyanobacteria) are prokaryotic organisms.Prokaryotic cells lack a membrane-bound nucleus and other membrane-bound organelles.Diatoms,algae (eukaryotic),and yeast (a fungus) are all eukaryotic organisms and possess a well-defined nucleus.Therefore,the correct answer is Blue-green algae.

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