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B
A. K. Chakrawarti
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C
Carl Sagan
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D
None of the above
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Solution
The correct option is A H. N. Schulz Thiomargarita namibiensis is a Gram-negative coccoid proteobacterium that is large enough to be visible to the naked eyes. It is the largest bacterium discovered by Heide N. Schulz and others in 1997.