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71. the coal industry is important to every industrial nations because most other industries are directly or indirectly dependent on it.
 
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72. the brightly colored kingfisher that perches until it sights a fish, then dives into the water to catch its prey.
 
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73. neptune circles the sun once every 164.8 earth years, and its day --- one rotation its axis --- is 15.8 hours.
 
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74. observable comets are occasionally attracted toward the inner solar system by the fields gravitational of nearby stars and giant molecular clouds.
 
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75. a single bacterium has the potential to produce 16 million copies of themselves in a day.
 
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76. atoms are held together by the electrical forces of attraction between each negative electron and a positive protons within the nucleus.
 
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77. the original aim of encyclopedias was to provide a general educational.
 
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78. icebergs are usually white, blue, or green, even although some are black due to rock material incorporated in them .
 
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79. both adult ladybugs and their larvae are voracious eaters of aphids, scale insects, and another plant pests.
 
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80. early english burlesque often ridiculed celebrated literary works and sentimentally drama.
 
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