Wetlands filter out excess nutrients and pollutants by trapping them in roots and soil, ______ plants and bacteria break them down into less harmful substances. A) where B) which C) wherever D) how E) whether Correct Choice: A (where) Explanation: "Where" means "in which" in adjective clauses. Source: Popular Science August 2007 https://books.google.com.tr/books?id=F8WT8-2-XQkC&lpg=PA76&ots=BHjyCgOen6 (page 76) Reference: https://learningenglish.voanews.com/a/adjective-clauses-that-describe-places-/5685049.html
