Briefly summarize the most widely accepted hypothesis for the extinction of the dinosaurs at the end of the Mesozoic Era.?

The most widely accepted hypothesis for the extinction of the dinosaurs at the end of the Mesozoic Era is the impact theory, which posits that a massive asteroid struck Earth around 66 million years ago, creating the Chicxulub crater in present-day Mexico. This event caused widespread fires, tsunamis, and a "nuclear winter" effect, leading to drastic climate changes that disrupted ecosystems. Additionally, volcanic activity in the Deccan Traps may have contributed to environmental stress. Together, these factors likely led to the mass extinction of about 75% of Earth's species, including the dinosaurs.