Volcanoes may have choked Earth, helped dinosaurs: CNN

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Low oxygen levels may have played a crucial role in two major extinction events, according to U.S. researchers. This decline in oxygen could have facilitated the dominance of dinosaurs over early mammalian ancestors. The findings suggest a significant link between atmospheric conditions and evolutionary outcomes. The implications of this research could reshape understanding of prehistoric life and extinction patterns. Overall, the study highlights the importance of environmental factors in shaping the course of evolution.
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Very interesting. Might be true.
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