Close-up images of Mars by the Mariner 9 probe indicated networks of valleys that looked like the stream beds on Earth. These images also implied that Mars once had an atmosphere that was thick enough to trap the sun's heat. If this were true, something happened to Mars billions of years ago that stripped away the planet's atmosphere.This paragraph best supports the statement that

ars once had a thicker atmosphere than Earth does.

ars now has little or no atmosphere.

he Mariner 9 probe took the first pictures of Mars.

ars is closer to the sun than Earth is.

ars is more mountainous than Earth is.

Close-up images of Mars by the Mariner 9 probe indicated networks of v

1.	Close-up images of Mars by the Mariner 9 probe indicated networks of valleys that looked like the stream beds on Earth. These images also implied that Mars once had an atmosphere that was thick enough to trap the sun's heat. If this were true, something happened to Mars billions of years ago that stripped away the planet's atmosphere.This paragraph best supports the statement that
A.	ars now has little or no atmosphere.
B.	ars once had a thicker atmosphere than Earth does.
C.	he Mariner 9 probe took the first pictures of Mars.
D.	ars is closer to the sun than Earth is.
E.	ars is more mountainous than Earth is.
Answer» B. ars once had a thicker atmosphere than Earth does.

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