Question

1. which aquatic ecosystem has a mix of fresh water and saltwater?

Explanation:

Estuaries are coastal areas where freshwater from rivers and streams mixes with saltwater from the ocean. This mixing creates a unique environment with varying salinity levels. Estuaries are highly productive ecosystems that support a diverse range of plant and animal species. They serve as important nurseries for many fish and shellfish species, providing a protected habitat for young organisms to grow and develop. Additionally, estuaries play a crucial role in filtering pollutants and sediments from the water, helping to maintain water quality in coastal areas.

Answer:

Estuary