The most efficient lungs with respect to oxygen uptake are found in this group of vertebrates.
A)amphibians
B)birds
C)fish
D)mammals
E)reptiles

Question

Quizplus · Accepted Answer

Birds have a highly efficient respiratory system that allows for a continuous flow of oxygen through their air sacs and lungs, resulting in maximal oxygen uptake. This adaptation allows birds to sustain high levels of aerobic activity such as flying for extended periods of time.

The Most Efficient Lungs with Respect to Oxygen Uptake Are