Chapter 1Social Studies History GeographyUnit 01 The U.S. GeographyThe Regions of the United StatesUnit 02 The United StatesA Nation of DiversityUnit 03 The U.S. EconomyFrom Farming to TechnologyUnit 04 People and CultureThe Native People of North AmericaUnit 05 The European Exploration of Asia and the AmericasThe Age of ExplorationUnit 06 Europeans in the AmericasThe Spanish Conquerors in the AmericasUnit 07 Colonial AmericaThe First French and English ColoniesUnit 08 The Declaration of IndependenceThe American RevolutionChapter 2ScienceUnit 09 How Are Living Things Classified?The Five Kingdoms of OrganismsUnit 10 ClassificationThe Seven Levels of ClassificationUnit 11 How Plants Meet Their NeedsPlant Structures and FunctionsUnit 12 How Do Plants Reproduce?Flowers and SeedsUnit 13 What Are Some Types of Plants?Plants with SeedsUnit 14 Plants without SeedsSeedless Vascular Plants and Nonvascular PlantsUnit 15 Plant Responses and AdaptationsHow Do Plants Respond to Their Environments?Chapter 3Mathematics Language Visual Arts MusicUnit 16 Numbers and Number SenseUnderstanding NumbersUnit 17GeometryGeometric FiguresUnit 18 Myths and LegendsThe Iliad and the OdysseyUnit 19 Learning about LanguageFigures of SpeechUnit 20 Classical ArtGreek and Roman ArtUnit 21 Classical MusicThe Western Musical Tradition