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21 inches would be the perimetre
Answer:
I don't what about this sorry
Correct answer is filtration.
Wetlands improve water quality by filtration. Wetlands do the process of filtration by trapping the sediments found in water.Wetlands also perform water filtration by nutrient and bacterial absorption. It can be found in all 6 continents (Asia, Africa, North America, South America, Australia, Europe), except Antarctica.
