School Encyclopedia. The Human Body. 200 Questions and Answers

What does eye color depend on? Why do we need vaccines? How do we sing? What are the functions of the nervous system? Why can't people breathe underwater? The series «School Encyclopedia» will become an indispensable assistant for schoolchildren in preparing reports, tests, and presentations. In the books of the series, strict scientific research is transformed into concise and understandable texts that tell readers about the diversity of the surrounding world.