22% of voters chose the correct answer: Some ~100 Trillion bacteria and 250-500 bacterial species! http://hvrd.me/pxnT309cZMd pic.twitter.com/9faBB8Rba8
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22% of voters chose the correct answer: Some ~100 Trillion bacteria and 250-500 bacterial species! http://hvrd.me/pxnT309cZMd pic.twitter.com/9faBB8Rba8
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