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

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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