Mystery #4Tier 2-3cells / growth
Why don't you just keep growing forever?
If growing is just cells dividing, and many of your cells can keep dividing for years, why don't you carry on getting taller and taller forever? Something tells your body when to stop. What?
Your guess
What's your hunch about why you stop getting taller instead of growing forever?
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.