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?

Your guess
What's your hunch about why humans still have an appendix if it does so little?
There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.
Make a guess to unlock the hints and the answer.