Mystery #1Tier 2body / lungs
Why do you have to breathe?
You breathe in and out around 20,000 times a day, mostly without noticing, and you can't stop for more than a couple of minutes. What is breathing actually for?
Your guess
What's your hunch about what breathing does for your body?
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.