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Although scientific theories vary, it is believed that _____________________ caused the Permian mass extinction. A) global warming B) an asteroid hitting Earth C) the introduction of dinosaurs D) the start
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Although scientific theories vary, it is believed that _____________________ caused the Permian mass extinction. A) global warming B) an asteroid hitting Earth C) the introduction of dinosaurs D) the start of glaciation and climatic changes

User SurfMan
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Although scientific theories vary, it is believed that D) the start of glaciation and climatic changes caused the Permian mass extinction.
User RomCoo
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The answer to this is D.
User Oleg Kurbatov
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