Final answer:
Estuaries are home to a variety of organisms with specific adaptations and ecological requirements.
Step-by-step explanation:
The organisms that live in estuaries are typically species with specific adaptations and ecological requirements. These include crabs, bivalves, snails, polychaetes, shrimp, and some fish species. Estuaries are characterized by fluctuating salinity levels, varying temperatures, and a mix of freshwater and saltwater. Organisms that can tolerate these conditions thrive in estuaries and have evolved features such as osmoregulation mechanisms to regulate salt and water balance in their bodies.