Obedecer las reglas

¿Qué significa migrar? Descubra qué animales migran y por qué migran a través de fotografías detalladas y texto simple. What does it mean to migrate? Discover which animals migrate and why they migrate through detailed photographs and simple text.

Summarizes how water changes from a solid to a liquid and back again, and introduces related facts such as that water freezes at thirty-two degrees Fahrenheit and that ice floats.

Conviértete en un superdetective y ayuda a resolver el robo del siglo. Acaban de dar el aviso de un importante robo. Este será el primer caso de una joven detective y no parece fácil: lo único que consigue de la escena del delito es una muestra de ADN que extrae de un guante. ¿Podrá encontrar al ladrón solo con eso? En el núcleo de casi todas las células de nuestro cuerpo hay una molécula de ADN con un código único que le da al organismo instrucciones como «Crea dos piernas, dos brazos, dos ojos y una nariz». Pero ¿qué es el ADN exactamente? ¿Y cómo puede haber tanta...

Read Along or Enhanced eBook: Discover what it takes to be an Emergency Room doctor in this enlightening, Spanish-translated nonfiction title. Readers learn about the hard work and dedication it takes to have a career as an ER doctor and what a typical day is like in the emergency room. From medical school to residency, medical symptoms to diagnosis, children will learn all about the steps it takes to get involved in this profession. This engaging title features vivid photos, helpful charts and diagrams, informational text, a glossary of terms, and an interview with a real life ER doctor to...

What has a head, two tails, and shoots across the sky? A comet. Coming from the far edges of the solar system, most comets travel around the Sun, while meteors appear as flashing streaks of light in the night sky. Explore these amazing celestial wonders as they zip through space! This book looks at the difference between comets and meteors and their effects on Earth. The physical characteristics of each are identified in detail. This book won’t come crashing down! It’s filled with fun facts that give additional information on this exciting science topic. This book allows students to use...

La obra se compone de un selecto conjunto de documentos históricos y comentarios de historiadores, organizado y sistematizado por el autor. Naturalmente, toda la documentación se refiere al período dominado por la figura de Oliver Cromwell y la institució