I think it is b because i know all other sources can be a freshwater ecosystem and swamps have a freshwater and salt water kinds so ya
The Treaty of San Ildefonso was an agreement between France and Spain where Spain gave back the colonial territory of Louisiana to France. It gave the French most of the Missisipi river, and new Orleans, which denied the U.S The Gulf of Mexico. I hope I could help! :D
Different Regions, Different Jobs
The long coastline in New England allowed many people to take jobs in the fishing industry. The shipbuilding industry also grew. New England's many ports grew into cities. New England was a trade center.