Looks at how the human body works, answering fifty questions on such topics as digestion, blood, bones and muscles, the immune system, senses, the brain, and the nervous system.
"Why is blood red? What exactly is a belly button for? Why don't your eyeballs fall out? answers all these intriguing questions about the science of the human body, and much more."--
Describes the characteristics that make humans living things, including being made of cells; needing water, air, sunlight, and energy; and growing and changing.