Question

this biome is characterized by the mixing of salt water and freshwater and has animals such as crabs, starfish, and beluga whales. rivers and streams open ocean estuary intertidal zone

Explanation:

An estuary is a biome where salt - water (from the ocean) and freshwater (from rivers and streams) mix. It is home to various organisms like crabs, starfish, and in some cases, beluga whales. Rivers and streams are mainly freshwater. The open ocean is mostly salt - water. The intertidal zone is the area between high and low tides along the shoreline and is not specifically characterized by the mixing of salt and fresh water in the same way as an estuary.

Answer:

Estuary