This is a textbook used in the second semester of the second year of high school in 2021. It contains problems and explanations related to the internal environment, stimuli and responses, ecosystems, and evolution/phylogeny, which are within the scope of university entrance exams. It compiles basic problems and is suitable for those who want to practice basic exercises. The name on the back cover has been erased. There are pencil markings like in the fourth photo, but they can be erased.