Final answer:
The most important thing for the students to include in their project is photographs of important events with their dates in sequential order.
Step-by-step explanation:
The most important thing for the students to include in their project is photographs of important events with their dates in sequential order. A timeline is meant to show the chronological order of events, so including photographs of important events will help the students visually represent the sequence of events in their lives. This will also allow the students to share specific moments and memories with their classmates.