The crustacean subphylum can be broken down into decapods, amphipods, copepods, and other types. This title offers readers from grades one through four comparisons between the needs and roles of different crustaceans, which will allow readers to understand the subphylum's importance. Readers will recognize and expand their knowledge about familiar species like the lobster and the shrimp, while being introduced to the likes of the wood louse and zooplankton....

Marine biology is both essential and inspirational to human life. The bodies of mollusks in particular allow them to live aboveground, underwater, or both, depending on the species. Readers will learn about the unique contribution oysters, squid, and slugs, all of which are different classes of mollusks, make to their habitats. Their diets, their vulnerabilities, what they leave behind, and what threatens them take shape on pages that depict what...