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Write a detailed report on one of the following topics:
1- Different types of beaches, their characteristics, and human control on coastal erosion.
2- Different types of saltmarshes, their characteristics, importance and human impacts on them.
3- Mangrove ecosystems, their characteristics, importance and natural and human impacts on them.
4- Coral reef ecosystems, their characteristics, importance and natural and human impacts on them.
5- Seagrasses and seaweeds ecosystems, their characteristics, and importance.