What major ecosystem and economic services areprovided by marine systems? What are the threemajor life zones in an ocean? Define coastal zoneand distinguish between estuaries and coastalwetlands. Explain why each has a high NPP. Explainthe ecological and economic importance of coastalmarshes, mangrove forests, and sea-grass beds.Explain how coral reefs are formed and how climatechange and ocean acidification are threatening them.Define open sea and describe its three major zones.List five human activities that pose major threats to marine systems and eight human activities thatthreaten coral reefs

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