Los estados de la materia — Los gases

Mildred y Ricardo, jamás imaginaron que sus vidas estuvieran tan unidas por un destino paradójico que los llevaría por caminos inimaginablesMildred, una niña de 14 años con una belleza abrumadora, pero vacía de afectos familiares conoce a su temprana edad un drama que lo llevaría a cometer la más alta degradación, tan solo por el gran afecto que le tiene a su único hermano desde pequeña.Ricardo un joven adolescente, que tan solo desea más atención en el hogar, que al no recibirlo empieza a vivir a su propio criterio, que lo llevaría a la debacle de su vida.Esta es la historia de ...

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.

Deforestation, hunting and global warming have endangered countless species. The orangutan, okapi, giant panda and the blue whale are just some of the 30 species on the brink of extinction that are featured in this book. They need your help. The International Conservation Society illustrates how many of these species are left in the wild, and the latest status regarding their natural environment. You'll learn how you can aid endangered species and help sustain the ecosystems that give them life.

Provides a simple introduction to the work that teachers do and other aspects of a teacher's life through full-color photographs and straightforward, engaging text. Original.