Biology Forums - Study Force

Rocks laid down at around the time of the Permian/Triassic mass extinction 250 million years ago contain a surprising amount of fullerenes (football-shaped carbon molecules). What evidence is there that these fullerenes came from outer space?
A)   The isotope ratio of carbon13 to carbon12 is too great for the fullerenes to have originated on the Earth.
B)   They show evidence of having been irradiated by the solar wind for millions of years.
C)   Gases trapped inside them could only have come from stars.
D)   The rocks they are found in contain decay products of short-lived radioactive aluminum isotopes that are believed to be produced only in supernovae (explosions of stars).

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