Answer the following question given this paragraph: 

Curiosity, the rover, has found evidence of a flowing stream on Mars. Layers of smooth, water-polished pebbles have been photographed. This is exactly what you would see in a stream on Earth. There are many surface features that look like water-eroded canyons. Since there was liquid water on Mars, scientists think that life might have existed there in the past. One of Curiosity's tasks is to sample the soil to search for carbon and other evidence of life.


Q: Evidence for the presence of what on mars makes scientists think that life might have existed there in the past?

 Choices:

- gas

- plasma

- air

- water

A:
water
