Unit 1: Scientific Investigation 1 1. Thinking Like a Scientist 2 2. Scientific Experiments 11 3. Lab Reports and Evaluating Results 31 4. SI Units and Measurements 37 5. Lab Safety and Scientific Tools 47 Unit 2: MATTER, CHEMICAL REACTIONS, and SOLUTIONS 59 6. Matter, Properties, and Phases 60 7. Periodic Table, Atomic Structure, and Compounds 71 8. Solutions and Fluids 83 Unit 3: MOTION, FORCES, and WORK 91 9. Motion 92 10. Force and Newton s Laws of Motion 99 11. Gravity, Friction, and More Forces in Everyday Life 109 12. Work and Machines 119 Unit 4: ENERGY 129 13. Forms of Energy 130 14. Thermal Energy 137 15. Light and Sound Waves 143 16. Electricity and Magnetism 159 17. Electrical Energy Sources 175 Unit 5: OUTER SPACE: The UNIVERSE and the SOLAR SYSTEM 183 18. The Solar System and Space Exploration 184 19. The Sun-Earth-Moon System 197 20. Stars and Galaxies 209 21. The Origin of the Universe and Our Solar System 219 UNIT 6: The EARTH, WEATHER, ATMOSPHERE, and CLIMATE 227 22. Minerals, Rocks, and the Earth s Structure 228 23. Earth's Crust in Motion 239 24. Weathering and Erosion 251 25. The Earth s Atmosphere and Water Cycle 259 26. Weather 269 27. Climate 281 Unit 7: LIFE: CLASSIFICATION and CELLS 291 28. Organisms and Biological Classification 292 29. Cell Theory and Cell Structure 303 30. Cellular Transport and Metabolism 313 31. Cell Reproduction and Protein Synthesis 321 Unit 8: PLANTS and ANIMALS 333 32. Plant Structure and Reproduction 334 33. Animals: Invertebrates 345 34. Animals: Vertebrates 355 35. Animal and Plant Homeostasis and Behavior 365 Unit 9: The HUMAN BODY and BODY SYSTEMS 373 36. Skeletal and Muscular Systems 374 37. Nervous and Endocrine Systems 385 38. Digestive and Excretory Systems 397 39. Respiratory and Circulatory Systems 405 40. Immune and Lymphatic Systems 415 41. Human Reproduction and Development 423 Unit 10: HISTORY of LIFE: HEREDITY, EVOLUTION, and FOSSILS 433 42. Heredity and Genetics 434 43. Evolution 445 44. Fossils and Rock Ages 457 45. History of Life on Earth 465 Unit 11: ECOLOGY: HABITATS, INTERDEPENDENCE, and RESOURCES 475 46. Ecology and Ecosystems 476 47. Interdependence and the Cycling of Energy and Matter 485 48. Ecological Succession and Biomes 497 49. Natural Resources and Conservation 509