Estuaries play a crucial role in supporting diverse marine life by providing a unique and productive ecosystem where freshwater from rivers mixes with salty seawater. This combination creates a highly productive environment that serves as a nursery for various marine species, including fish, crabs, mollusks, and birds. The sheltered waters of estuaries offer protection for young marine organisms to grow and thrive, contributing to the overall biodiversity of the area. Additionally, estuaries help filter nutrients and pollutants from incoming freshwater, improving water quality and creating a healthy habitat for a wide range of species.