Answer:
Option D.) Groundwater
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Consequently plant roots will get more moisture with less effort. It also improves soil structure due to alternate drying and cooling and soil aeration which helps in multiplication of micro-organisms. This is the reason that farmers plough their field during summer. These are reasons why farmers plough their fields during the summer.
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The best and most correct answer among the choices provided by the question is <span>b. oil</span> <span>.
</span>A thick, black liquid formed from the buried remains of microscopic marine organisms is oil .
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Hope my answer would be a great help for you. </span>
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