Official 30 Lec 3
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Question 2 of 6
What was discovered on Mars that suggests water once existed there?

A.

Microorganisms that can form only in the presence of water.

B.

A mineral that can form only in the presence of water.

C.

. Proteins that have the same structure as proteins found on Earth.

D.

Large deposits of iron and potassium that can form only in the presence of water.

我的答案:

正确答案:B

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