Question

Dinosaurs, birds, early mammals and plants were major life-forms that existed in the____________.

a. Mesozoic Era
c. Cenozoic era
b. Paleozoic era
d. Devonian era

Answer 1

Dinosaurs, birds, early mamals all existed in the Mesosoic Era. The Mesosoic Era is a period in geologic that began about 225 million years ago and ended about 65 milion years ago. The Mesosoic ended with the asteroid impact even that caused the extinction of the dinosaurs.

Answer 2

The organisms that are presented in this item: (1) dinosaurs, (2) birds, (3) early mammals, and (4) plants existed during the Mesozoic Era. This is the type from 248 million to 65 million years ago, lasting for about 180 million years. Thus, the answer to this item is letter A.