A discussion of bacteria, one of the six major classifications of living organisms, examining the biology of bacteria, and describing rod-shaped, round, curved, and mycobacteria varieties.

A biography of James Watson, one of the scientists who helped discover the structure of DNA, the carrier of heredity in higher organisms.

Describes how certain organisms adapt to their environment, ways to protect the environment, genetic engineering, and biotechnology.

Explores how organisms adapt to changing environments, from changes in physical appearance to adaptations in behavior, and examines the evolution of different plant and animal species.

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

Discusses the microscopic organisms known as phytoplankton and the important functions they serve in replenishing earth's atmosphere, in the marine food chain, and more.

Photographs and simple text written in both English and Spanish explain how food chains link small organisms to large animals; and describes a polar food web, which connects two food chains and animals such as fish, seals, and whales.

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.

An introduction to DNA and heredity that explains how DNA and genetics determine certain factors related to health, behavior, and appearance, what introns and exons are, how cells use DNA, and what the laws of heredity mean for people.

Covers over 2,000 terms arranged thematically. The themes include cells, the chemistry of life, inheritance and genetics, evolution, classifying living things, microorganisms, plant biology, animals, and ecology.

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

Presents a short study of cells, how they work together to help the body to breathe, digest food, and heal injuries.