Final answer:
The Cretaceous-Paleogene extinction event, also known as the K-Pg or K-T extinction, occurred approximately 65 million years ago at the end of the Cretaceous Period. This mass extinction event resulted in the extinction of more than half of the species on Earth, including the dinosaurs, and marked the end of the dinosaur age.
Step-by-step explanation:
The subject of this question is Biology and it is of High School level.
The Cretaceous-Paleogene extinction event, also known as the K-Pg or K-T extinction, occurred approximately 65 million years ago at the end of the Cretaceous Period. This mass extinction event resulted in the extinction of more than half of the species on Earth, including the dinosaurs, and marked the end of the dinosaur age.
The main cause of this extinction event was the impact of a large asteroid in what is now the Yucatán Peninsula. This impact caused widespread environmental changes, such as dust ejected into the atmosphere, which led to global climate changes and the subsequent extinction of many species.