Introduction to sharks
Sharks are a group of fast-swimming medium and large marine fish, belonging to the subphylum of vertebrate cartilaginous class, which is marine.
Introduction to starfish
Starfish is the most representative echinoderm in structural physiology. The body is flat, mostly symmetrical with five spokes, and the boundary between the body disk and the wrist is not obvious. Live with your mouth down and your mouth up.
Brief introduction of mangrove forest
Mangrove is a wetland woody plant community, which grows in the intertidal zone of tropical and subtropical coasts and consists of evergreen trees or shrubs. It plays an important role in purifying seawater, preventing wind and waves, fixing and storing carbon, and maintaining biodiversity, and has the reputation of "coastal guardian" and "marine green lung".