Question

earth and mars
earth is much more welcoming to life than mars is. earths thick atmosphere helps keep the planet warm, with an average temperature of 57°f. in addition, over two - thirds of earth is covered by water. these conditions make it easy for all kinds of organisms to live here. mars, on the other hand, has a thin atmosphere and is farther from the sun. therefore, it is much colder. marss average temperature is about - 60°f! in addition, the surface of the planet is mostly dry and dusty. without enough water and warmth, most organisms would struggle to survive on mars.
what is the main, or central, idea of the passage?
earth is better able to support life than mars is.
earth has a thick atmosphere and a warm temperature.

Explanation:

The passage compares Earth and Mars. It mentions Earth's thick atmosphere (keeping it warm with an average temperature of \(57^{\circ}F\)) and large water coverage (over two - thirds), which support life. Mars has a thin atmosphere, is colder (\(- 60^{\circ}F\) average temperature), and dry/dusty. The overall comparison shows Earth's superiority in supporting life.

Answer:

Earth is better able to support life than Mars is.