<h2>Answer:</h2>
C. Build and use solar power plants.
<h2>Explanation:</h2>
Coal is a non renewable source of energy, once consumed cannot be recovered. Therefore the quantity of coal is reduced with its continuous usage throughout in the world. On the other hand solar energy is a renewable source of energy and it has to do nothing with the quantity of consumption. So we can say that replacing non renewable sources of energy such as coal with renewable sources of energy that is solar energy can make the coal supply last longer.
irregular polygon is any polygon that is not a regular polygon. It can have sides of any length and each interior angle can be any measure. They can be convex or concave, but all concave polygons are irregular since the interior angles cannot all be the same.
Circulatory system. This includes blood.
Glycolysis and fermentation are processes of converting complex molecule or substance into simpler form for easy absorption or usage. Both converts sugars or carbohydrates into useful form but differs in a way that fermentation uses yeast or bacteria in the process of conversion.<span>
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