"The origin of species by means of natural selection, or the preservation of allies in the struggle for life" - a publication that changed the perception of humanity about its nature. In this outstanding work of Charles Darwin, the theory of evolution through natural selection plays a leading role, which reveals the process of formation of species and their adaptation to the environment. The author investigates the laws of natural selection and the role of natural selection in evolutionary processes. This book leaves immeasurable traces in scientific literature and helps everyone to understand the complexity and beauty of nature.