Bird and fish respiratory systems are similar in that both
A) employ a countercurrent exchanger.
B) have air sacs.
C) function by means of unidirectional flow of the environmental medium over the gas exchange membranes.
D) consist of infoldings of the body.
E) All of the above

Question

Quizplus · Accepted Answer

Both birds and fish have a unidirectional flow of the environmental medium (air for birds, water for fish) over their gas exchange membranes, which is efficient for gas exchange.

Bird and Fish Respiratory Systems Are Similar in That Both