Discusses viruses, including their physical characteristics and some of the diseases they can cause.

Explores the science behind germs.

Text and color photos and illustrations introduce the organisms that can live in the human mouth, intestines, skin, hair, and blood.

Describes the various characteristics of plant and animal cells, what is inside them, how they reproduce, cloning and gene technology, bacteria and viruses, and protection against disease.

Presents information on the structure and function of various kinds of cells found in humans and other organisms.

Text, illustrations, and photographs describe the structure and functions of plant cells.

Features a comprehensive source about the human organism, how it works, and what can go wrong and provides authoritative information on all the elements, large and small, that make up the human body.