Answer:
Whales are mammals and have lungs for respiration.
Fishes belong to Pisces group and have gills.
Step-by-step explanation:
Whales are aquatic mammals. They do not have gills but have lungs. They have blowhole from where the air is inhaled and exhaled. Blowholes are connected to the lungs where the exchange of respiratory gases occur.
Fishes are classified as Pisces. They have gills are the organ of respiration. gaseous exchange occurs in gills. The oxygen dissolved in the surrounding water is taken in while the CO2 present in the blood is released out.