People get energy from food and use energy to exercise. This book teaches young readers about chemical and kinetic energy and explains how electricity and fossil fuels are energy sources.
How do we breathe and why do we need oxygen? Your lungs work hard to keep oxygen flowing through your blood. This book explains how the respiratory system functions to take in the air we need to live.
As soon as food touches your tongue, it begins a long process of moving through different parts of your body. This book explains how the human body breaks down food to get nutrients and stay healthy.
