| 41. | The process involves obtaining sperm and freezing it in liquid nitrogen.
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| 42. | But reducing the nitrogen content undermines its value as a fertilizer.
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| 43. | Different nitrogen mustards will have different chemical groups ( R ).
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| 44. | The fuel for the system was of monomethylhydrazine and nitrogen tetroxide.
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| 45. | This electronegative atom is usually fluorine, oxygen, or nitrogen.
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| 46. | For a long time, sources of nitrogen compounds were limited.
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| 47. | Dissolved in water, it is neither acidic nor nitrogen excretion.
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| 48. | A small amount of nitrogen is added to soil by rainfall.
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| 49. | Only a small fraction of soil nitrogen is held this way.
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| 50. | Nitrogen narcosis is a problem when breathing gases at high pressure.
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