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16. An organism used in medical research and as an indicator of contamination is a. Escherischia coli b. Clostridium botulinu
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In this context, the most diversity of life on earth is occupied by the microbes. However, within the group of microbes we have the prokaryotic cells which have the highest number of individuals. Specifically, bacteria are more numerous than Archea. So, the correct answer is B

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