The LUNGS
the gill
lungs
That'd be the lung.
The respiratory system takes oxygen into the body and rids itself of carbon dioxide.
the lungs!!
lungs
The lungs are where carbon dioxide exchange takes place. Part of the respiratory system.
I wouldn't exactly characterize it as separating carbon dioxide and oxygen, however, I think the answer you are looking for is the lungs which takes up oxygen into the bloodstream and expels carbon dioxide out of the bloodstream into the lungs so we can breathe it out again.
the kidneys remove waste from the bloodstream.
lungs
The same as ours... They inhale air into their lungs - where oxygen is absorbed into the bloodstream, while carbon dioxide is expelled.
the kidneys
the kidneys remove waste from the bloodstream.
In the lungs. This process is called the Gas Exchange.Gas exchange is the delivery of oxygen from the lungs to the bloodstream, and the elimination of carbon dioxide from the bloodstream to the lungs. It occurs in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.
Carbon dioxide is excreted from the lungs.
carbon dioxide
Carbon dioxide is expelled from our lungs.