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Mystery #3Tier 2-3evolution / the body

Why do we still have an appendix if we don't need it?

Tucked onto your gut is a little dead-end tube called the appendix. It can be removed and you'll never miss it, and it sometimes even bursts and turns dangerous. Why would the body keep a part that seems so useless?

A diagram showing the appendix's location in the human gut, with a labelled close-up.
Photo: BruceBlaus · CC BY 3.0 · via Wikimedia Commons

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