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gills
Because a dolphin is a mammal, and not a fish. A dolphin's respiratory system is similar, for the most part, to a human's respiratory system.
Most fish use gills for gas exchange instead of lungs
Most fish use gills for gas exchange instead of lungs
Humans must first dissolve the gasses in water (in the alveolii of the lungs) before we can extract it, whereas fish only can get the gasses already dissolved. Also - fish have a one-way respiratory system whereas humans have an in and out respiratory system.
respiratory system of gold fish
There are many similarities between fish and humans. Fish and humans have many of the same organs. We both have a digestive system and a reproductive system.
Human air, fish water
Internal Gills
gills which are their lungs
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We don't have Gil filaments but fish do.