• a plant with big leaves
• a jar of petroleum jelly

1. Take a blob of jelly and coat the top side of a leaf. Make sure to apply a thick layer all over.
2. Take another blob and cover the bottom side of a different leaf.
3. In a few days, one leaf will look just fine.
4. But the other leaf will curl up and wither. That's because it can't breathe.

Which leaf curled up after a few days?

the one with jelly on the top side
the one with jelly on the bottom side
they both curled up

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