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6.15. In Wikipedia, look up "Cretaceous-Paleogene extinction event" and answer this question: Which of the following is an accurate statement regarding the Cretaceous-Paleogene extinction event?a. It was a sudden mass extinction of three-quarters of the plant and animal species (including the dinosaurs) on Earth approximately 66 million years ago.b. It is marked by a thin layer of sediment called the K-Pg boundary, which can be found throughout the world in marine and terrestrial rocks.c. It was thought to have been caused by the impact of a massive comet or asteroid 10 to 15 km in diameter which devastated the global environment.d. All the above

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