The estuary is NOT a major type of marine ecosystem.
the estuary is a partly retained, shore water body where untouched water from rivers and streamlets integrates with brackish water from the ocean.
What is an estuary?
Estuaries are defined as marshes are bodies of water usually seen where rivers assemble in the sea.
Estuaries are residences of unusual flora and fauna communities that have acclimated to saline water a combination of freshwater sapping from the ground and salty seawater.
Thus, the correct answer is an estuary.
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