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Mystery #1Tier 2microbes / body

Why is your body covered in tiny living things?

Right now, trillions of microscopic living things are living on your skin, in your mouth and inside your gut, so many that they rival the number of your own cells. You can't feel them at all. Why are they there?

A petri dish where colourful colonies of microbes have grown in the shape of a child's handprint, the microbes that were living on their hand.
Photo: StefaniaItaly, Wikimedia Commons · CC BY-SA 4.0 · via Wikimedia Commons

Your guess

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