TOEFL iBT Reading

Practice session

Passage: In coastal wetlands, grasses and reeds slow incoming water, causing suspended sediment to settle around plant roots. This gradual buildup can raise the marsh surface and help it keep pace with moderate sea-level rise. When storms remove vegetation or when seawalls block sediment from reaching the marsh, however, the system loses part of its natural repair mechanism. Which choice provides the best prose summary of the passage?

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