Mystery #3Tier 2plants / transport
Why do leaves have veins running through them?
Hold a leaf up to the light and you'll see a web of fine lines branching across it, like a map of tiny rivers. Every leaf has them. What are those veins for?
Your guess
What's your hunch about what the veins in a leaf are for?
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.