This series explores the 5 accepted kingdoms that make up the living world—animals, plants, fungi, protista, and bacteria—and one kingdom currently proposed by scientists: other single-celled microorganisms called Archaea. Each book deals with a particular kingdom and the topic of taxonomy of its organisms, and explains how the organisms are classified into the smaller groups of phylum, class, order, family, genus, and species. Each book also covers the ways in which the different organisms are used by people and how they interact with organism of other kingdom. Each paperback book contains 48 pages each. Designed for Grade 7 level reading. Sold as 6 books total.