Final answer:
The extinction of dinosaurs was the disappearance of only a small percentage of all the dinosaurs that ever lived.
Step-by-step explanation:
The statement is True.
The extinction of dinosaurs was not the disappearance of all dinosaurs that have ever lived. It was the disappearance of only a small percentage of all the dinosaurs. The most recent extinction event, called the Cretaceous-Tertiary extinction, occurred about 65 million years ago and resulted in the disappearance of most dinosaur species, except birds. This extinction event was caused by the impact of a large asteroid in the present-day Yucatán Peninsula and the subsequent global climate changes caused by the dust ejected into the atmosphere.