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| Description: In the Carboniferous, plants with lignin-reinforced tissues flourished, died, and became compacted into coal, a nonrenewable fossil fuel It took millions of years of photosynthesis, burial, and compaction to form coal, which is why fossil fuels are said to be nonrenewable sources of energy Picture Stats: Views: 116 Filesize: 260.68kB Height: 794 Width: 1102 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=48244 |