Question

The most well-known of the big five extinctions marked the end of the dinosaurs. The world saw a loss of 40% of genera and an estimated 76% of species. Overwhelming evidence suggests that the extinction was caused by a 10-km-diameter asteroid that struck Earth. The crater from this impact has been identified in the Yucatán Peninsula of Mexico, buried beneath more recent sedimentary rocks. This impact had a global effect, blocking sunlight for extended periods of time and affecting global climate. The extinction of the dinosaurs opened new ecological niches for mammals to take over.
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