Final answer:
Wetlands along coasts can have either freshwater or saltwater, depending on factors such as proximity to the sea, tidal movement, and salt content. Salt marshes are an example of wetlands along coasts that have saltwater. Wetlands filter water and protect coastal lands from storms and floods.
Step-by-step explanation:
Wetlands along coasts can have either freshwater or saltwater. Some wetlands are fed by rivers and have freshwater, while others are influenced by tidal waters and have saltwater. The type of water in wetlands depends on factors such as proximity to the sea, tidal movement, and salt content. For example, salt marshes are wetlands along coasts that have saltwater. Wetlands are important habitats that filter water and protect coastal lands from storms and floods.