Which of the following describes a characteristic of estuaries?

Estuaries are coastal areas where freshwater from rivers and streams meets and mixes with saltwater from the ocean. This unique environment provides a range of habitats that are rich in biodiversity. One of the defining characteristics of estuaries is their role as nurseries for many marine species, including fish and shellfish. The shallow waters and abundant nutrients found in estuaries create ideal conditions for young marine organisms to grow and develop, which is crucial for their survival.

In addition to serving as nurseries, estuaries also offer protection from predators and provide abundant food sources, which contribute to the high productivity and biological diversity observed in these regions. The mixing of freshwater and saltwater creates a dynamic habitat that supports a variety of species at different life stages, making estuaries essential for the life cycles of many marine organisms. This characteristic not only underscores their ecological significance but also highlights their importance in maintaining the health of marine ecosystems.