The field of evolutionary biology is rapidly expanding to include both extant and extinct animals and plants. This book on organic evolution provides an updated explanation of the topic using straightforward language and the most recent concepts, theories, and data. There are five sections in the text: The concepts, arguments, and hypotheses of evolution are covered in Part I. The Evolutionary Mechanism is examined in Part II. A methodical approach to the process of speciation is provided in Part-Ill. Part-V offers insight into the genesis of life, fossil records, and history of life on Earth, while Part-IV analyses the fundamental principles of evolution. Diagrams are used to illustrate the text frequently to ensure that the underlying ideas are clear. For biology students, the book might be a helpful textbook.