What is the coastal marine ecosystem consisting of at least 60 species of plants that grow underwater in shallow marine and estuarine areas along most continental coastlines?

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Sea grass beds are the coastal marine ecosystem consisting of at least 60 species of plants that grow underwater in shallow marine and estuarine areas along most continental coastlines. Salt marshes are dominated by salt-tolerant grasses and sedges and are typically found in the intertidal zone, while mangrove forests are found in tropical and subtropical tidal areas and consist of trees and shrubs adapted to grow in salty water. Intertidal zones are the areas of the shore between the high tide and low tide marks, and coral reefs are underwater ecosystems formed by colonies of coral polyps.

What Is the Coastal Marine Ecosystem Consisting of at Least