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The top documents tagged [posterior sacs]
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Respiration & Vocal Communication. Avian Lungs 1.Respiratory System –Delivers O 2 and rids CO 2 2.Thermoregulation –Evaporative Heat Loss 3.Vocal sound
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Chapter 31 Reptiles & Birds. Evolution Hylonomus (hylo- "forest" + nomos "wanderer") earliest known reptile lived 315 MYA - about 12 inches long - Dinosaurs
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Bird respiration
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