Answer to Question #58803 in Other Biology for mary
The development of dinosaurs whose gait allowed them to move without compressing their lungs is evolutionarily advantageous because it is maximizing its intake of oxygen during an arduous, energy demanding task.
Imagine the tetrapod's lungs are a bucket filled with water with an inlet and an outlet to represent oxygen intake and oxygen consumption by the body, respectively. When the tetrapod is resting, the inlet and outlet are more or less equal to each other. However, when it is running, the inlet (oxygen intake) decreases and the outlet (oxygen consumption) increases. You can see that very rapidly, there will not be enough oxygen to sustain movement. In contrast, if we apply the same thought experiment to the dinosaur, the inlet (oxygen intake) remains constant while the outlet (oxygen consumption) still increases. You can see that even though the dinosaur will eventually run out of oxygen and have to stop running, it will be able to sustain movement longer than the tetrapod.
This is of course advantageous for preying and obtaining food, fight or flight situations, etc.
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