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.