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The immune system is a large network of cells, tissues, and organs that work together, acting like a fort with guards to keep out risky viruses and bacteria and destroy invaders. Readers will learn how researchers are striving to improve the body's immune system to fight off disease. Full-color illustrations help readers visualize the immune system at work. Free downloadable Teacher's Guide available.

What is the difference between a representative democracy and an autocracy or dictatorship? Are all democracies equal? Why are some people attracted to authoritarian governments? This fascinating book explains why democracy can be a fragile form of government, requiring constant effort and attention from its citizens. Discover the ways governments respond to the needs and wants of its people"--

South Korea is highly regarded for its transformation from a largely agricultural society to an urban, technologically advanced nation. Read all about the mountains and hills that dominate South Korea's landscape, its growing urban centers, the kingdoms and dynasties that prospered from its resources, and daily life and culture for South Koreans today"--

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Keine Beschreibung.

Mexico's varied landscapes-from deserts and mountains to tropical rainforests and fertile plateaus-are as diverse as its people and traditions. Read all about the country's land and resources, the ancient civilizations that thrived there, and its history as a Spanish colony, as well as daily life and culture today for people across Mexico"--

From its roots in ancient Greece to its revitalization in the Age of Enlightenment and beyond, democracy as a form of government has changed over time. Find out what threats democracy faces today, and how it is a process that requires constant upkeep and renewal"--

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Democratic governments and processes are based on shared ideals for the common good of all citizens. Find out what these democratic values are and how to take part in democracy in your own country and community"--

Haiti, known for its mountainous and rugged land, is rich in agriculture as well as cultural traditions born from resistance. Read all about the country's land and resources, its beginnings as a profitable colony, the revolution that made it the world's first Black-ruled republic, and the daily life and culture of modern Haitians"--

South Korea is highly regarded for its transformation from a largely agricultural society to an urban, technologically advanced nation. Read all about the mountains and hills that dominate South Korea's landscape, its growing urban centers, the kingdoms and dynasties that prospered from its resources, and daily life and culture for South Koreans today"--

Keine Beschreibung.

Young people all over the world are doing it. Whether through anti-racism protests, taking part in model governments, or joining global climate strikes, youth are strengthening democracy by exercising one of the fundamental democratic rights: participation. This thoughtful book uses real life examples to show how citizens can exercise their rights and make their communities and countries more democratic, just, and fair-even when they are not y...