Dinosaurs ruled the Earth for 150 million years until an asteroid impact 65 million years ago caused mass extinction by blocking sunlight and leading to widespread starvation. However, scientists believe the asteroid impact is only part of the story. They're exploring other potential factors, such as the type of terrain it struck and evidence in ocean floor sediments. Researchers analyze sediment cores and plant fossils to understand the environmental changes before and after the impact. Some paleontologists suggest a gradual decline in oxygen levels and other environmental shifts played a significant role in the dinosaurs' extinction.

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