izes water on the surface of Mars? a. Billions of years ago there were lakes and rivers on the surface of Mars, but none exist today. b. There is no evidence that water ever existed on the surface of Mars. c. There have been lakes and ri

The answer is a.

Explanation: Billions of years ago, there were lakes and rivers in the surface of mars because mars had a denser atmosphere and higher surface temperatures which allowed a vast amount of liquid water on the surface. Recently, most of the water on mars today exist as ice.