Fish have gills, and filter oxygen from the water. Humans have lungs and get their oxygen from the air.
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
gills
a organ systems are shared by both fish and birds because they have the same respiratory system, nervous system and reproductive system.
We don't have Gil filaments but fish do.
Most fish use gills for gas exchange instead of lungs
Most fish use gills for gas exchange instead of lungs
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.
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.
Evolution.
they dont have respiratory systems like we do, they have gills. They can only breath in liquid water environments
No. Fish skeletal physiology is different from human.