Which of the following substances is created over millions of years from the decomposed remains of plants and animals? A. silver
B. gold
C. coal
D. iron
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The correct answer is C. coal.
Coal is formed over millions of years from the decomposed remains of ancient plants and animals, primarily in swampy environments. As layers of soil and sediment accumulate over time, heat and pressure transform the organic material into coal. This process is known as coalification.
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