This reference book contains all the theoretical material on the biology course required to pass the Unified State Exam. It includes all elements of content, verified by test materials, and helps to generalize and systematize knowledge and skills for a secondary (complete) school course. The theoretical material is presented in a concise, accessible form. Each section is accompanied by examples of test tasks that allow you to test your knowledge and degree of preparedness for the certification exam. Practical tasks correspond to the Unified State Exam format. At the end of the manual, answers to tests are provided that will help schoolchildren and applicants test themselves and fill in existing gaps. The manual is addressed to schoolchildren, applicants and teachers.