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Doctoral student Catherine Powers traveled to fossil sites around the world, including this one in Greece, to study ancient bryozoan marine communities.
The greatest mass extinction in Earth’s history also may have been one of the slowest, according to a study that casts further doubt on the extinction-by-meteor theory.
Creeping environmental stress fueled by volcanic eruptions and global warming was the likely cause of the Great Dying 250 million years ago, said USC doctoral student Catherine
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