It proves there is life on Mars. It provides evidence there may be life on Mars. It proves there was an advanced civilization on Mars. It provides evidence of an advanced civilization on Mars.
I gave my students this multiple choice question: What is significant about the discovery of water on Mars?

Only one answer is correct among these 4 choices:
- It proves there is life on Mars.
- It provides evidence there may be life on Mars.
- It proves there was an advanced civilization on Mars.
- It provides evidence of an advanced civilization on Mars.

Could you tell me which one is correct?

It provides evidence there may be life on Mars.