Question

The rate of breathing in a fish is faster than pigeon

Answer 1

The rate of breathing in fish is faster than a pigeon because

Aquatic organisms like fishes obtain oxygen from water present in dissolved state through their gills. Since the amount of dissolved oxygen in water is fairly low compared to the amount of oxygen in the air, the rate of breathing in aquatic organisms is much faster due to the low concentration of oxygen in the environment than that seen in terrestrial organisms.