Answer:
C. These similarities and differences make the presence of life on Mars a possibility.
Explanation:
this sentence^ is the best conclusion for the paragraph. the other ones do not make as much sense.
early in the paragraph, we can read the sentence: <em>There is, therefore, a likelihood that life may exist there in the future.</em>
it states the same idea as answer c.
i hope this helped you
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Answer: I suppose looking at the grammatical structure of the author's sentences.
