ASBOG Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The Cenozoic era is indeed divided into two primary periods known as the Paleogene and the Neogene. This classification reflects the significant evolutionary and geological developments that occurred during these times. The Paleogene period encompasses the time from the end of the Cretaceous period approximately 66 million years ago to around 23 million years ago. During this time, mammals began to diversify significantly following the extinction of the dinosaurs, leading to the rise of modern mammals.

The Neogene period follows the Paleogene, spanning from about 23 million years ago to roughly 2.6 million years ago. This period is marked by further evolution of numerous land mammals and the development of the first hominids, as well as significant shifts in climate and geography. The division into these two periods allows for a clearer understanding of the developmental milestones in Earth's history during the Cenozoic era, showcasing the progression of life forms and the changes in the planet's environment over time.

Understanding this classification is essential for studying geological time and the evolution of life, which is why the selection of Paleogene and Neogene is correct in identifying the two main periods of the Cenozoic era.