Please answer the following question: Fact 1: Coal is used for generating heat by burning. Fact 2: Coal and lignite are the lithified remains of plants. Given the two facts above, answer the question "What are the lithified remains of plants used for?" with the following options: - heat production - generating heat by burning - harvesting crops - damming rivers - food and shelter - heat is produced - A transportation fuel - planting seeds
Answer:
generating heat by burning