Which of the following characterizes the lungs of most terrestrial vertebrates?

Question

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Most terrestrial vertebrates have lungs that function through tidal ventilation, in which air is inhaled and exhaled through the same pathway. This is in contrast to air sacs, which are found in birds and allow for unidirectional airflow. Complete emptying in exhalation is not typical of most terrestrial vertebrates' lungs, as they usually have some residual air left in their lungs after exhalation. Crosscurrent and countercurrent airflow are found in fish gills, not in vertebrate lungs.

Which of the Following Characterizes the Lungs of Most Terrestrial