Read this excerpt from "Mars: Landscape of the Red
Planet."
What is the effect of the nonexistence of water on the
planet Mars?
Recent evidence may point to the existence of great bodies
of water that once covered the planet. The discovery of
water on Mars could aid scientists in determining whether
life ever existed on the planet or whether it could exist in
the future. For now, it remains clear that, given the
inhospitable conditions of the planet's surface, no life
currently exists there.
O Life has grown wildly there.
Scientists have taken water samples from the planet.
O Research about the planet cannot be developed
O Life cannot survive there.