The group of animals with an efficient respiratory system, in that there is no "stale air" after exhalation, is the ____.
A)amphibians
B)birds
C)mammals
D)reptiles
E)fish

Question

Quizplus · Accepted Answer

Birds have a unique respiratory system where air flows one way through the lungs, allowing for efficient gas exchange and no "stale air" remaining in the lungs. This allows for birds to fly at high altitudes where oxygen levels are low. Other animals may have some degree of efficient respiratory systems, but birds are the most notable for their one-way flow of air through the lungs.

The Group of Animals with an Efficient Respiratory System, in That