One reason alternative energy sources are needed is because A. the energy needs of the world are decreasing
B. there is no limit to the supply of fossil fuels
C. the population of the world is decreasing
D. the supply of fossil fuel is diminishing

D.) the supply of fossil fuel is diminishing

Explanation:

Unlike other resources, fossil fuels are not renewable, so it doesn't take long to run out.

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the food storage products of chrysophytes are oils or the polysaccharide laminarin.   formerly classified as plants, the chrysophytes contain the photosynthetic pigments chlorophyll a and c all but the yellow-green algae also contain the carotenoid pigment fucoxanthin.