Read the passage. Seawalls can protect roads and buildings from storm surge, but they may also push wave energy toward neighboring beaches and prevent wetlands from shifting inland. In some places, a wall is necessary; in others, dunes and marsh restoration may absorb water with fewer side effects. A shoreline plan should not ask only what can be held in place, but what must be given room to move. How does the ending help organize the meaning of the passage about shoreline seawalls?