Bacteria are one-celled organisms that can be seen only with a microscope.
They're so small that if you lined up a thousand of them end to end, they could fit across the end of a pencil eraser.
Not all bacteria are harmful, and some bacteria that live in your body are helpful.
For instance, Lactobacillus acidophilus — a harmless bacterium that resides in your intestines — helps you digest food, destroys some disease-causing organisms and provides nutrients.
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