Hope this helps!
wetlands.....
purify water, protect from flooding, provide habitats for animals, and soak up flood water.
People can help donate their time and money if possible to help preservation societies protect the wetlands. They can also quit polluting and not destroy the wetlands.
Most wetlands are in Louisiana. Some appear in Florida.
wetlands breed insects eaten by fish.
I know that Texas has wetlands. They are on the coast. Some other states might also have wetlands though.
Not throwing garbage in them
wetlands are wonderful. wetlands are wet. wetlands help prevent flooding. wetlands are home to many species. wetlands have alot of plants.
the Grand Canyon
I have NO idea, but wetlands have a lot of trees, I think. Trees help the air. Sorry, I'm studying wetlands right now, so I have no idea
harm
Usually No. The tide is what usually cleans wetlands. Heavy rains usually cause extra run off of chemicals from farmland that pollutes wetlands.
ponds and swamps.
No. They are common there today.