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Anamniotes to Amniotes

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Question
Answer
Ancestral Respiration   Interfered with Lateral undulation; Motion would compress one lung and expand another and vice versa so no breathing while walking  
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Mammalian Respiration   Upright posture so that dorsoventral ventilation could occur. So expansion and compression of lungs is in tune with body movements to allow breathing while moving.  
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Non-Avian Dinosaur Respiration   Cuirassial pump includes gastralia as struts to expand the body cavity; Head and tail bob while walking to compress and decompress lungs and drive ventilation  
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Avian Respiration   Lungs- thin capillaries that dont compress/decompress; Airsacs do the pumping linked to wings squeezing and stretching cavity; Allows for constant flow of oxygen rich air in capillaries, and thinner capillaries because of no flexion so higher efficiency  
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Pre-Avian Dinosaur Respiration   Know airsacs existed from the presence of pneumatic bones; Respiration came before flight; Lightweight with more efficient oxygen intake to increase energy of large organisms; Allow for flight, didn't cause flight  
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