what is bacteria? how they are harmful
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You cannot escape bacteria, they are everywhere! The good thing is that very few bacteria are harmful, but bad bacteria aren't much fun. Bad bacteria like Pat O'Gen make you sick, while other bad bacteria spoil your food and water, making it unsafe. Bad bacteria love when you or your environment is unhygienic or dirty.
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a member of large group of unicellular organisms which lack cell membrane bound cell organelles
they are harmful because they cause various diseases in plants and animals
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