Explain the importance of groundwater as a source of freshwater?

What is the name of the two satelites on mars

Explain why it’s important for scientists to study the sun. list at least two challenges researchers face when examining earth’s nearest star.

The earth formed roughly 4.5 billion years ago, yet evidence of life dates back to about 3.5 billion years ago. which one is not a possible hypothesis of how life on earth arose?