Wetlands improve water quality by
a. filtration
b. distillation
c. osmosis
d. all of the above

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.

You not be doing this in a quiz. if you actually studied your work you would know the answer. the answer though is that they would use gdp per capita because it measures a smaller portion (person). this could show individual growth per person in the country.