Final answer:
Leo and his friends exemplify that individuals can incite communal change by successfully raising money and working collectively to save and improve a local park.
Step-by-step explanation:
The text provides evidence to support the opinion that anyone can make a difference in a community through the description of Leo and his friends' efforts to save the park. They have been raising money, reflecting dedication and initiative, and their goal was finally reached, which shows their effort was successful. Moreover, the collective activity they are engaging in—gathering volunteers and tools, and showing a lot of heart—exemplifies how community action can lead to positive changes.