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Narwhals are often called the "unicorns of the sea." But these fascinating creatures are members of the whale family. Read all about narwhals as you practice addition. This Spanish math book combines math and reading skills and uses real-life examples of problem solving to teach subject-area content. The dynamic images, detailed sidebars, practice problems, and math diagrams make learning addition easy and fun. Text features include a table of contents, a glossary, an index, and captions to build vocabulary and increase understanding of math and reading concepts. An in-depth problem-solving...

Bajo la apariencia de un simple ladrón, un psicópata, un sicario o un tipo anónimo y gris que, llevado por sus demonios interiores, se ve abocado al crimen, puede apreciarse el decisivo rol que la figura del asesino ha tenido a lo largo de la historia del género negro hasta erigirse, como el detective o la clásica femme fatale, en protagonista habitual del mismo. El presente libro supone un acercamiento ameno y riguroso, desgranado por algunos de los mejores especialistas en la actualidad. Nombres como los de Jesús Palacios, Enrique Urbizu, Paco Camarasa, Juan Madrid o Amir Valle, entre ...

Introduces young readers to the tyrannosaurus rex, examining its physical characteristics, eating habits, and extinction.

This book is a comprehensive, practical presentation of the principles of behavior modification and guidelines for their application. It teaches forms of behavior modification ranging from helping children learn necessary life skills to training pets, to solving personal behavior problems.