Official 30 Lec 3
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

正确答案:B

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