Question

Dinosaurs became extinct at the end of the _________.

A. Paleozoic
B. Cretaceous
C. Jurassic
D. Tertiary

Answer 1

Dinosaurs became extinct at the end of the Cretaceous period, which was the last period of the Mesozoic era.

Step-by-step explanation:

The correct answer is B. Cretaceous. Dinosaurs became extinct at the end of the Cretaceous period, which was the last period of the Mesozoic era. The Cretaceous-Tertiary extinction event led to the loss of most of the large-bodied animals of the Mesozoic era, including dinosaurs. Birds are considered the living descendants of one of the major groups of theropod dinosaurs.