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Estuaries are characterized by unique ecological features and:

ABarren landscapes

BBiotic communities

CVolcanic activity

DDesert conditions

Answer:

B. Biotic communities

Read Explanation:

  • Many rivers develop a highly specialised zone before joining the proper sea. This zone is called - Estuary

  • An estuary is a transitional zone between rivers and sea representing an ecotone possessing unique ecological features and biotic communities.

  • An estuary is semi-enclosed part of the coastal ocean containing brackish water that has free connection with the sea on one side and on the other side it is connected with a river mouth and receives fresh water.

  • Estuarine sedimons are, anoxic below the first few centimeters unless they have large particle size and/or large number of burrowing animals such as ghost shrimp (Callianassa) and the hemi chordat worm (Balanoglossus)


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