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Scientists believe Mars once had

thick clouds of carbon dioxide
rings
water
oxygen

User Marsolmos
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2 Answers

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Answer:

The answer is rings scientists believed mars once had rings

Step-by-step explanation:

User Iasksillyquestions
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Answer:

The correct answer would be option B. Scientists believed Mars once had water.

Step-by-step explanation:

User Iibrahimbakr
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