The plants living in water is also called as hydrophytes or macrophytes. The adaptations of aquatic plants are floating plants and dissected leaves. The adaptations of aquatic animals are respiration through gills, locomotion through fins and tail, and streamlined body for better swimming.
And as for aquatic animals, some of the adaptations of aquatic animals are: Their body is streamlined and hence, they can swim easily. They have gills as the respiratory organs. They have fins as the locomotory organs, Various types of fins are present in fishes such as dorsal fins, pectoral fins, caudal fins etc.