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| Balancing Forces |
| Chapter 1: Why does the train rise? |
| Chapter 2: Why does the train rise without anything touching it? |
| Chapter 3: Why does the train fall? |
| Chapter 4: Why does the train float, even though gravity is acting on it? |
| Chapter 5: Why does the train change from floating to falling? |
| Inheritance and Traits |
| Chapter 1: Why are wolves different even though they are all the same species? |
| Chapter 2: Why is Wolf 44’s color similar to one pack but different from the other? |
| Chapter 3: Why isn’t Wolf 44 like the Bison Valley Pack in hunting style and size? |
| Chapter 4: How can scientists investigate questions about traits? |
| Environments and Survival |
| Chapter 1: Why are the snails with yellow shells not surviving well? |
| Chapter 2: Why are the snails with banded shells more likely to survive than the snails with yellow shells? |
| Chapter 3: Why were snails with yellow shells more likely to survive in their environment 10 years ago? |
| Chapter 4: How can engineers use what they learn from organisms’ traits to design solutions? |
| Weather and Climate |
| Chapter 1: Which island’s weather would be best for orangutans? |
| Chapter 2: Which island’s weather will continue to be best for orangutans? |
| Chapter 3: Over many years, which island’s weather will be best for orangutans? |
| Chapter 4: How can the WPO prepare for natural hazards that might damage their offices? |