"Essays on Comparative Physiology. The structure and development of the living and the disappeared” is a unique work that immerses the reader in the fascinating world of biological research and discoveries, revealing the secrets of living organisms of the past and present. The author, remaining anonymous, created a book that becomes a real guide to the complex and multifaceted science of comparative physiology. This book is intended for those who are not just interested in nature, but seek to understand the mechanisms of life at a deep level, who are looking for answers to questions about how different types of living beings are arranged and develop, and why some of them disappeared from the face of the Earth. The book focuses on the amazing diversity of the structure and functions of organisms, from the simplest single-celled to complex multicellular creatures. The author masterfully guides the reader through the history of the development of living forms, telling about how evolution shaped their physiological features, and what mechanisms underlie their adaptation to the environment. The book details both modern species and extinct life forms, making it a particularly valuable source of information for lovers of paleontology, biology, and evolutionary science. Essays on Comparative Physiology is not just a collection of scientific facts, but a lively and vivid narrative in which each page is filled with curiosity and passion for knowledge. The author uses a rich language, rich in metaphors and images, which makes complex topics accessible and fascinating. The reader will learn about how the structure of organs and systems affects the survival of species, how physiological features have changed in the course of evolution, and what discoveries in this area have already changed our understanding of nature. This book is especially suitable for students, teachers, researchers and anyone interested in the biology, evolution and history of life on Earth. It will be of interest to readers aged 16 years and older who are looking for deep and rich content, as well as those who like to expand their knowledge of nature and scientific discoveries. For those who appreciate scientific accuracy, vivid description and logical harmony, the Essays on Comparative Physiology will become an indispensable source of inspiration and new ideas. The peculiarity of the book is the author’s ability to combine scientific rigor with a lively style of presentation, which makes complex topics understandable and exciting. Inspired by classical works in the field of biology and physiology, the author creates a work that can be compared with the masterpieces of scientists such as Carl Linnaeus or Charles Darwin, only in modern performance. The book raises important topics - from adaptation mechanisms and evolutionary changes to the causes of species extinction, which makes it relevant and important for understanding the modern world. If you are looking for a book that will not only expand your knowledge about wildlife, but also make you think about the future of our planet, "Essays on comparative physiology. The structure and development of the living and the disappeared” is exactly the work that is worth reading. It will open up new horizons for you and help you understand how amazing and complex life is on Earth, and why it is important to preserve its wealth.