Answer:
Estuaries are one of the most productive ecosystems in the world and contain a rich biodiversity of life. An estuary may appear to be just an expanse of mudflats but it is teeming with life, including bacteria, snails, worms, crabs, fish, shellfish, mangroves, seagrass, and migratory and coastal birds.
Explanation:
Most estuaries occur where rivers empty into the ocean. Because river water is full of organic (dead plant and animal) matter, estuaries are rich in nutrients, and tiny water plants and animals, called plankton, are plentiful. ... Estuaries contain a diverse array of plant and animal life.
Many fish and shellfish are spawned in estuaries. Full of nutrients and home to resilient organisms, estuaries provide rich feeding grounds for fish and birds
