| 41. | Supplies of electrical power, breathing air and food, though, are good at least through Wednesday.
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| 42. | This modified stomach allows these fish to breathe air.
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| 43. | As such they must breathe air regularly, though they can remain submerged for long periods.
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| 44. | Discovery has electricity, breathing air, food and water to remain aloft until Thursday if necessary.
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| 45. | First thought to be salamanders, these creatures able to breathe air were later recognized as fish.
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| 46. | Young lungfish come to the surface to breathe air when they are about 25 mm long.
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| 47. | Also, humans need to breathe air, not water.
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| 48. | The systems that cool Mir and remove carbon dioxide from its breathing air were operating Monday.
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| 49. | A short pipe allowed breathed air to escape.
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| 50. | The rock gunnel is capable of remaining above the waterline at low tide and breathing air.
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