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Seagrass meadows are underwater ecosystems composed of seagrasses, which are flowering plants adapted to live in marine environments. These meadows can be found in shallow coastal waters around the world and provide important habitat for a variety of marine species, including fish, crustaceans, and sea turtles. Seagrass meadows also play a critical role in maintaining water quality by absorbing nutrients and stabilizing sediments. They are threatened by human activities such as coastal development, pollution, and climate change.