Cumplir con la ley: Si...Entonces (Following the Law: If...Then)

Life on Earth depends on carbon. In fact, about 18.5 percent of a human body's mass is carbon. How carbon is taking in and given off through animals' breathing, the burning of fossil fuels, and more can be shown in the model known as the carbon cycle. Though this concept can be confusing, all readers have a chance to understand this concept through the text and simple diagrams in this book. Both struggling readers and those looking for review can find the most important components and vocabulary of the carbon cycle in low-level, accessible text.

In an entertaining way, shows how to add, subtract, multiply, and do long division without a calculator.

Color photos and easy-to-read text five a realistic insight into the typical working day of an on-the-job zookeeper.

La vida de san Francisco de Asís es notablemente diferente de las vidas de los santos al uso. Álvaro Pombo, en simpatía con la antigua tradición franciscana, elige en este libro un estilo correspondiente al gran sobresalto intelectual y afectivo que produce el biografiado. Adopta, por eso, el punto de vista y la voz o voces de los primeros hermanos que acompañaron a Francisco. Con una notable mezcla de atrevimiento, seriedad y simpatía profunda, Álvaro Pombo se convierte, al mismo tiempo, en la voz plural, brillante y humilde de aquella primera comunidad franciscana, una docena mal...