Final answer:
Tyrannosaurid fossils are of Late Cretaceous age, which was the period when dinosaurs reached their peak in size and distribution. This was the third and final period of the Mesozoic Era, also known as the Age of Dinosaurs. . Tyrannosaurus Rex, one of the most famous tyrannosaurids, lived during this time and weighed at least 7 tons.
Step-by-step explanation:
The correct answer is B. Late Cretaceous. Tyrannosaurid fossils are of Late Cretaceous age. The Late Cretaceous period spanned from about 145 to 66 million years ago. This was the third and final period of the Mesozoic Era, also known as the Age of Dinosaurs. Tyrannosaurus Rex, one of the most famous tyrannosaurids, lived during this time and weighed at least 7 tons. During the Late Cretaceous, dinosaurs reached their peak in size and distribution. It was a time when Earth's overall climate was warm, and even the poles lacked ice. The period ended with the dramatic extinction of the dinosaurs.
Tyrannosaurids, including well-known species like Tyrannosaurus rex, are fossils of Late Cretaceous age. During the Late Cretaceous, dinosaurs reached their peak in size and distribution. It was a time when Earth's overall climate was warm, and even the poles lacked ice. These large, carnivorous dinosaurs lived during the later part of the Cretaceous period, which spanned from approximately 145 million to 66 million years ago.