Analysis of Comet Dust Collected and Returned to Earth by the Stardust

question 5

Multiple Choice

Analysis of comet dust collected and returned to Earth by the Stardust mission has shown that

• A) simple life exists in comets
• B) organic molecules can form in space and survive the passage through the Earth's atmosphere
• C) organic molecules are completely absent in comet dust so impacts could not have made a significant contribution the organic material present on the early Earth
• D) impacts must have been the only source of organic material present on the early Earth

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