21 “..., that is, a living organism that is too small to see with the human eye. Every time someone brews a batch...”

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24 “... human health. Some viruses and species of bacteria can be targeted to kill cancer cells while others can...”

25 “... human health. Some viruses and species of bacteria can be targeted to kill cancer cells while others can...”

26 “.... They are a scourge of humanity and are largely the result of fecal contamination of the environment. The sum...”

27 “.... They are a scourge of humanity and are largely the result of fecal contamination of the environment. The sum...”

28 “... humans, economically important animals, or crops. A number of eukaryotic microbes, including several...”

29 “... humans, economically important animals, or crops. A number of eukaryotic microbes, including several...”

30 “... on for farming to the water we drink, everything humans need to survive is intimately coupled with the activities...”

31 “... on for farming to the water we drink, everything humans need to survive is intimately coupled with the activities...”

32 “... for fighting off those that get inside us. The human immune system has been ridding our bodies of pathogens...”

33 “... for fighting off those that get inside us. The human immune system has been ridding our bodies of pathogens...”

34 “...Climate change is altering the planet and threatens humanity. Earth system models simulate...”

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