Final answer:
Organic sedimentary rocks are formed from the remains of living organisms, such as plants and animals, and coal is a significant type of rock in this category.
Explanation:
Organic sedimentary rocks form from the accumulation and lithification of organic matter, such as leaves and other plant or animal material. These rocks are mainly composed of the remains of once-living organisms, with coal being a common example that forms from buried and transformed trees over time.
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