| 31. | The air sacs expand and contract due to changes in the volume in the thorax and abdomen.
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| 32. | These dots are the air sacs.
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| 33. | The disease, almost always caused by smoking, destroys air sacs in the lungs, leaving patients struggling for breath.
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| 34. | To lighten its vertebrae, " Apatosaurus " had air sacs that made the bones internally full of holes.
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| 35. | He figured that sound waves would make the air sacs vibrate, but he did not know how much.
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| 36. | It somberly detailed how cigarette smoking destroys alveoli, tiny air sacs in the lungs that are critical to breathing.
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| 37. | The life-threatening condition emerges when blood and fluid leak into the lungs'tiny air sacs and patients have trouble breathing.
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| 38. | Beginning in the 1970s, the effects of sauropod air sacs on their supposed aquatic lifestyle began to be explored.
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| 39. | These sounds are reflected by the dense concave bone of the cranium and an air sac at its base.
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| 40. | Instead, Sands shoots a native bladder bird and uses its air sac to keep breathing as he gives chase.
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