Wetland Function

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Wetlands contribute to the stability of the environment in multiple ways, preventing flooding by holding water; filtering and purifying surface water; and, surprisingly, release vegetative matter which helps feed fish in the rivers.

Review: Wetland Function


Explanation

Creating a filter: The prompt raises a flag. Namely, we have a list, so something to check quickly is whether the elements of the list are in parallel form. By the way, there's no problem with separating the elements of a list in a sentence with semicolons, especially when some or more of the items are lengthy. This is a list of verbs, and they are "preventing," "filtering and purifying" and "release." "Release" is in error and should match the other two as "releasing." Since "preventing" is outside the underlined portion and hence can't be changed, we know that we will have to settle on "ing" forms in the correct answer.

Applying the filter: There's only one answer choice meeting our criterion. The correct answer is (B).


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