How was conceived and what laws life developed on our planet? That did result in forming of metazoons? How does arise up and what is condition mutations resulting in the changes of forms of life? Sociological researches show that in search of answers for these basic questions people today all rarer call to data of science, preferring to be satisfied by superficial and frequently incorrect explanations that television and yellow press offer. A book of doctor of biological sciences, known paleontologist and science popularizer Alexander Markov is an attempt to hurdle mutual непонимания between serious researchers and wide reader. "Birth of complication is a simultaneously keen recital that takes place today at the cutting edge of biological science, and at the same time is a serious attempt to generalize and to systematize the knowledge accumulated by humanity in this area. The enthralling and popular book of Alexander Markov contains information, that can interest not only a wide reader but also specialists, at the same time.