Los ciclos de vida de los mamíferos (Mammal Life Cycles)

Many insects hatch from eggs and molt several times as they grow bigger. Others, such as butterflies, undergo a complete metamorphosis. A common science curriculum topic, insect life cycles may be confusing because of these differences. However, this book breaks down these cycles into easy-to-understand steps in both accessible language and colorful diagrams readers can turn to for review again and again. The most important vocabulary needed to talk about insect life cycles is further explained in fact boxes and an extended glossary.

Ants are known as one of nature's hardest working animals. Their strength and persistence in bringing food to their colonies have been well documented. Now, beginning readers have a chance to learn about some of the littlest bugs in this volume written just for them. Complete with information about what ants eat, how they live, and generally how they stay so busy, this book is a must-have to satisfy the curiosity of your youngest naturalists. Eye-catching and unique photographs complement the low-ATOS text and aid in comprehension.

For many years, people believed there were nine planets that orbited the sun. Now we say there are eight. What happened to the ninth planet, Pluto? What are the different planets like? What exactly makes a planet a planet? These are the many intriguing questions answered with this high-interest book, crafted to be accessible for readers of all levels. Young astronomers will be especially fascinated by the stunning photographs and the "Make the Grade" fact boxes.

"Eran diez los mariachis. Ahora solo quedan nueve. Ay, caramba, ¿qué pasó? ¡La guitarra se rompió! Cuenta hacia atrás con esta simpática banda de diez mariachis."--P. [4] of cover.

Understanding the concepts of solids, liquids, and gases is central to the early science curriculum. States of Matter uses simple, authentic Spanish text to introduce ELL students to these important concepts. Each book features a strong photo-text match and clear, full-color diagrams to enhance comprehension.

Los motivos que me llevaron a crear esta obra van más allá de los sentimientos comunes por los cuales se escribe a la madre, a la patria y a la tierra. El universo es el campo de acción, pues hay toda una gama de manifestaciones filosóficas que rodean el mundo del hombre, su pobreza y tristeza. El libro está estructurado en poesías que marcan el principio y el fin en la trayectoria del ser humano -sin ninguna ambición-; particularmente el autor se centra en este sentir. Se recogen los disimiles problemas por los que pasa el hombre, y se ha hecho todo un itinerario de acontecimientos de ...