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
  • 1Mars now has little or no atmosphere.
  • 2Mars once had a thicker atmosphere than Earth does.
  • 3the Mariner 9 probe took the first pictures of Mars.
  • 4Mars is closer to the sun than Earth is.
Answer:- 1
Explanation:-

Solution:
The paragraph states that Mars once had a thick atmosphere, but that it was stripped away. The other choices, true or not, cannot be found in the passage.

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