| 21. | Like all mammals, baleen whales breathe air and must surface periodically to do so.
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| 22. | To breathe air, " Hypostomus " must orient itself vertically.
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| 23. | After 2 hours of breathing air without hydrogen sulfide the mice returned to normal.
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| 24. | Patrons waiting to exit will have fresh breathing air until the exit doors close.
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| 25. | "For him, " said Debe, " listening to music is like breathing air ."
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| 26. | A third of us breathe air which endangers our health.
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| 27. | Some can move on land like snakes and breathe air.
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| 28. | Another concept for breathing air is to use re-usable amine bead carbon monoxide scrubbers.
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| 29. | The penpoint gunnel can breathe air when out of water.
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| 30. | The dolphins, which breathe air, drown when large purse seine nets close over their heads.
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