A team is drilling into deep subsurface sediments (500m depth) to analyze microbial life in an anaerobic aquifer. What is the MOST LIKELY challenge they will face when collecting subsurface microbial samples?

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Oxygen contamination altering microbial communities

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Microbial growth increases upon exposure to surface air

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Difficulty finding microbial life at such depths

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Surface soil microbes naturally mix with deep samples

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A team is drilling into deep subsurface sediments (500m depth) to analyze microb...

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