La reproducción de las plantas (Plant Reproduction)

[English] What is the difference between a savanna and a prairie? How do bison, zebras, and other grazers avoid hungry grassland predators? Trek across the plant-covered landscape of this book, and find out what makes grasslands one of Earth's treasures. [Spanish] ¿Qué diferencia hay entre una sabana y una pradera? ¿Cómo escapan los bisontes y las cebras de los depredadores? Camina entre los altos pastos de este libro. Descubrirás por qué los pastizales son uno de los grandes tesoros de la Tierra.

Who were the earliest Americans? When, how, and from where did they enter and spread across the continent? And what is their relationship to modern Native Americans? Anthropologists develop theories to answer these questions based on the evidence they discover. Their theories—and the discoveries that prove and disprove them—are highlighted in this fascinating volume, full of awe-inspiring facts and incredible breakthroughs. Readers will feel like anthropologists and archaeologists themselves as they read about bones and artifacts, and what they reveal about the ancient cultures that roamed...

Carlos III acaba de subir al trono de España y firma de inmediato otro Pacto de Familia con Francia. La respuesta inglesa es inmediata. Aparece sobre las costas de La Habana la mayor fuerza naval de la historia, sólo superada siglos después en el desembarco de Normandía. La Habana se apresta a defenderse con sus exiguos medios, colocando a su frente como Gobernador del castillo del Morro al capitán de navío don Luis de Velasco e Isla, el cual no defraudará las esperanzas de los españoles, iniciándose una de las batallas navales y terrestres menos conocidas de la historia de España,...

It was known as the age of the dinosaurs, but other fascinating creatures roamed the Earth at the same time. Learn about lesser-known animals from the prehistoric era that are no less fascinating! Students will be engaged in reading about ancient animals like Gigantopithecus, Titanoboa, Megalodon, and more as they develop their skills at reading and writing numbers. This Spanish math book combines math and literacy skills, and uses real-life examples of problem solving to teach subject area content. The full-color images, intriguing sidebars, practice problems, and math diagrams make learning ...