Which of the following is TRUE？A．Environmental changes must have caused the end－Permian ma
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Which of the following is TRUE？
A．Environmental changes must have caused the end-Permian mass extinction.
B．Massive volcanic eruptions might have caused the end-Permian mass extinction.
C．The disappearance o{ dinosaurs was a consequence of the end-Permian mass extinction.
D．Marine animals appeared as a result of the end-Permian mass extinction,
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