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Explains, in simple terms, the reasons for skin color, how it is determined by heredity, and how various environmental factors affect it.

Did you know that most animals in the world don't have backbones? Learn more about invertebrates in this engaging, Spanish-translated nonfiction book. Readers will learn all about mollusks, arthropods, arachnids, and crustaceans while being stimulated from cover to cover with its detailed images and charts, intriguing facts, and informative text. This 6-Pack includes six copies of this title and a lesson plan.

Parte de la exitosa serie Little People, BIG DREAMS, Marie Curie cuenta la inspiradora historia de uno de los científicos más famosos del mundo / Part of the bestselling Little People, BIG DREAMS series, Marie Curie tells the inspiring story of one of the world's most famous scientists.

As a land that’s constantly in flux, Earth sometimes reveals clues about the plants, animals, and other organisms that lived long ago. Fossils teach us much about what life was like millions of years ago, answering the questions of how Earth changed and maybe even why it changed. This essential Earth science topic is thoroughly explained through manageable text, fact boxes, informational charts and diagrams, and a glossary and index. Readers will become young Earth detectives by the time they’re through with this text!