The Big Question: Why do we have lines on our palms?

Newsround's Big Question is a chance for you to ask about the mysteries of the world that you want answered!

You can send in a question from you or your class here. and we'll try to get an expert to tackle it.

Hamstel Junior School asked: Why do we have lines on our palm?

Here's TikTok's Dr Maddy Dann to explain.