GEOLOGY

Detailed explanation-1: -The Cenozoic cooling trend culminated in an ice age during the Pleistocene Epoch, which is also the epoch during which the human genus (Homo) and human species (Homo sapiens) evolved. Human beings became ascendant, and all of recorded human history occurred during the Holocene Epoch.

Detailed explanation-2: -The Cenozoic Era is the most recent of the three major subdivisions of animal history. The other two are the Mesozoic and Paleozoic Eras. The Cenozoic spans only about 65 million years, from the end of the Cretaceous Period and the extinction of non-avian dinosaurs to the present.

Detailed explanation-3: -The Cenozoic Era is the “Age of Mammals.” North America’s characteristic landscapes began to develop during the Cenozoic. Birds and mammals rose in prominence after the extinction of giant reptiles. Common Cenozoic fossils include cat-like carnivores and early horses, as well as ice age woolly mammoths.

Detailed explanation-4: -The era that Homo sapiens first appeared was during the Cenozoic era, Quaternary period, near the end of the Pleistocene epoch of the present age or between 300, 000 and 200, 000 years ago. Homo sapiens are a very recently evolved species compared to the other inhabitants of this planet.

Detailed explanation-5: -The Cenozoic Era is generally divided into three periods: the Paleogene (66 million to 23 million years ago), the Neogene (23 million to 2.6 million years ago), and the Quaternary (2.6 million years ago to the present); however, the era has been traditionally divided into the Tertiary and Quaternary periods.