If a 10-mile-wide comet hit Earth, how would this likely affect the history of life?
A) Most species would become extinct, and the rest would remain more or less unchanged.
B) A mass extinction would occur, followed by lots of evolutionary change among descendants of the survivors.
C) A slow climate warming and drying would begin, decreasing the biological diversity on Earth.
D) Continental drift would be reversed, and all the continents would slowly be pushed together again.
Answer: B
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