The book “Their role and significance in the life of the Earth” by Sergey Vasilievich Kalesnik is a fascinating and in-depth study devoted to the most important aspects of the ecosystem of our planet. In this work, the author not only analyzes the role of various living organisms, but also raises questions about the interaction of man with nature, which makes it relevant for each of us. Sergey Kalesnik, known for his work in ecology and biology, offers the reader a unique look at how different species, from microscopic bacteria to majestic trees, affect life on Earth. His style of presentation combines scientific rigor with accessibility, which allows even those who do not have a special education to easily perceive complex concepts. The book uses vivid examples and metaphors that make the material lively and fascinating. “Their Role and Significance in the Life of the Earth” will be of interest to a wide range of readers Students and teachers involved in ecology, biology and related sciences will find in it a lot of useful information and fresh ideas. However, the book is not limited to the academic audience. Nature lovers, activists and anyone interested in sustainable development and environmental issues will be able to draw inspiration and motivation for action from it. Even those who just want to better understand how our world works will find a lot of interesting things in it. The topics raised in the book are extremely important in light of current environmental challenges. Kolesnik discusses how climate change, pollution and loss of biodiversity affect ecosystems and ultimately our existence. He emphasizes that each species has its own unique role, and the loss of even the most insignificant at first glance the body can lead to unpredictable consequences. This idea makes us think about how we, humans, can and should preserve nature in order to maintain balance on our planet. Kolesnik not only analyzes problems, but also offers solutions. It inspires the reader to be proactive, calling for informed consumption and respect for the environment. The book is full of practical tips on how each of us can contribute to the protection of nature, whether through the selection of environmentally friendly products or participation in volunteer projects. The style of Sergei Kalesnik is clear and logical. He masterfully combines scientific facts with personal observations and stories, which makes reading not only informative, but also emotionally rich. His previous works, such as “Ecology and Man” and “Green Planet”, have already won the recognition of readers and critics, and the new book will not be an exception. If you are looking for a book that will not only expand your knowledge of nature, but also inspire action, “Their Role and Significance in Earth’s Life” will be an excellent choice. This work not only informs, but also encourages us to reflect on our place in the world and how we can make it better. Read, discover the amazing world of nature and realize your responsibility for its preservation.