Download or read book The Cenozoic Era written by Britannica Educational Publishing and published by Britannica Educational Publishing. This book was released on 2010-04-01 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt: Its constant evolution over the millennia since its inception has made the Earth a dynamic entity, subject to numerous climactic and environmental forces that are forever changing this planet. In its most recent stage, the planet has seen an incredible diversification in plant and animal life, with the most prominent development of the Cenozoic era being the emergence of mammals. This book examines our most immediate ancestors and the geologic, geographic, and environmental factors that helped make their primacy inevitable.