Every living thing is made up of cells. The human body alone can have more than 30 trillion cells! This book introduces readers to the building blocks of biology. What are cells made of? What do they do? How do they differ between plants and animals? This book answers these questions and more through accessible text and corresponding images. Information is supported by fact boxes, sidebars, and graphic organizers to enhance the reading experience. Readers will be excited to learn how the smallest things sometimes make the biggest difference in life!