Aquatic animals breathe much faster than terrestrial animals because of :

Asked in UPSC CAPF 2009 · Topic: Respiratory System (Comparative Anatomy of Respiratory Organs (e.g., gills, tracheae, lungs))

1. low amount of dissolved oxygen in water
2. low amount of hemoglobin in their blood
3. high metabolic rate of aquatic animals
4. large amount of dissolved nitrogen in water

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