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Question
Write the most important characteristic that Aspergillus niger, Clostridium butylicum, and Lactobacillus share.
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Solution
These all are acid producers. Examples of acid producers are Aspergillus niger (a fungus) of citric acid, Clostridium butylicum (a bacterium) of butyric acid and Lactobacillus (a bacterium) of lactic acid.
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