TOEFL iBT Reading

Practice session

Passage: [A] In coastal wetlands, grasses and reeds slow incoming water, causing suspended sediment to settle around plant roots. [B] This gradual buildup can raise the marsh surface and help it keep pace with moderate sea-level rise. [C] When storms remove vegetation or when seawalls block sediment from reaching the marsh, however, the system loses part of its natural repair mechanism. [D] Where should the sentence be inserted? Sentence: Healthy vegetation is therefore not just a surface feature but part of the wetland's engineering.

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