3-6 ┊ 2388 words ┊ ◄))
3-6, 2388 words, 20 minutes audio time.
The world is full of microscopic creatures. But who would have thought that we needed these tiny creatures to digest the food in our bodies or make the oxygen we need to breathe? Get out your microscope, and get ready to examine the microorganisms we can’t live without.
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