the continents were once joined together most life-forms that existed in the past are still present today most of Earth's surface was once covered by molten rock rocks have been transformed from one type to another
I gave my students this multiple choice question: Scientists have discovered fossils of the same organisms in many different parts of the world. These fossils provide evidence that

Only one answer is correct among these 4 choices:
- the continents were once joined together
- most life-forms that existed in the past are still present today
- most of Earth's surface was once covered by molten rock
- rocks have been transformed from one type to another

Could you tell me which one is correct?

the continents were once joined together