Which of the following is a compelling hypothesis for the unidirectional airflow of the archosaur lung?
a. A high oxygen concentration during a radiation in the early Mesozoic
b. A low oxygen concentration during a radiation in the early Mesozoic
c. A high oxygen concentration during a radiation in the late Paleozoic
d. A low oxygen concentration during a radiation in the late Paleozoic
e. None of the above



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