Desafíos matemáticos

This novel tells the remarkable story of an unusual community of Siberian bandits who are the opponents to Stalin and deported to Transnistria, a long section between Moldova and Ukraine, even today no man's land, ravaged by corruption, organized crime and smuggling. There grew up Nikolai proud to recognize no other authority than his elders and defining themselves as honest criminals.

There are many steps in the nitrogen cycle that include difficult concepts and words: denitrification, prokaryotes, ammonia, and more. With the help of this understandable book, even struggling readers will grasp this cycle of nature. Low-level language, fact boxes, and an extended glossary provide readers with essential vocabulary explanations that allow them to further understand each step of the cycle. Full-color diagrams aid readers' comprehension as they move through the cycle from start to finish, and then around again.

Ofrece una explicación de las soluciones y mezclas y en qué se diferencian, así como ejemplos de mezclas y soluciones.

Learn how to help others in your community. This exciting Spanish nonfiction book describes the many ways that volunteers make a difference, from cleaning up parks to helping in food banks. Perfect for young readers, the book includes a short fiction stor