What makes scientists think that life is a possibility on Mars?
Evidence of water
Evidence of fire
Evidence of technology

	If water didn’t form some of the gullies on Mars, what did?
Bulldozers
Nitrogen gas
Carbon Dioxide

	What will the Odyssey spacecraft set out to do?
Send back data about the chemical elements of the Martian surface
Look for hydrogen, which is an indicator of water
Make daily temperature maps of the Martian surface
All of the above (and more!)