The meteorite Nakhla is one of several meteorites believed to originate on Mars, which show small tunnel structures similar to Earth rocks inhabited by rock-eating microbes. But Nakhla is special for another reason. What is that reason?
A) It was the first meteorite to exhibit such tunnels.
B) The rock's composition has been traced to a specific crater on Mars.
C) The fall of this meteorite was observed, so it could not have been contaminated by being on Earth for a long period.
D) It is a carbonaceous chondrite, and as such contains carbon compounds and volatile materials as a result of never having been heated.
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