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We wouldn't be able to digest our food properly without our gut bacteria. Crops around the world would start to die without the nutrients generated by microbes. Dead fish would float to the surface of lakes and oceans, and ocean life would be extinguished.
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Microorganisms act as key components in ecosystem functioning and sustenance of all the tropic levels and life forms on earth. ... Microorganisms represent the richest inventory of living molecular diversity on earth, constituting 60% of the total biomass, and all basic ecosystem processes are dependent on them.