Sharks have existed on Earth longer than trees have.
Why it is true
The first sharks appeared around 400 million years ago, while the first trees only emerged about 350 million years ago. This means sharks are older than forests and even older than the rings of Saturn.
Source: Natural History Museum
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.