Introduction to mangrove wetlands: The most wonderful feature of mangroves is the so-called "viviparous phenomenon." The seeds of many plants in mangroves begin to germinate in the fruit before they leave the mother body and grow into rod-shaped hypocotyls. . After the hypocotyl develops to a certain extent, it breaks away from the mother tree and falls into the mud on the beach. After a few hours, it can take root and grow in the mud and become a new plant. The hypocotyl that fails to take root in the mud in time can follow the sea currents. It drifts on the sea for several months and takes root on the coast thousands of miles away.