Biology · Animal Classification

With reference to the taxonomic classification of certain aquatic and semi-aquatic vertebrates, consider the following statements: I. Penguins belong to the class Aves and are flightless marine birds adapted to cold oceanic environments. II. Seahorses are classified under Pisces (bony fishes) and are characterised by their upright swimming posture and prehensile tails. III. Dugongs, commonly referred to as sea cows, are marine mammals belonging to the order Sirenia. IV. Softshell turtles are amphibians that inhabit freshwater wetlands and river systems. V. Salamanders belong to the class Reptilia, sharing several morphological traits with lizards. How many of the statements given above are correctly matched with their biological classification?