Carbonized remains are thin, approximately two-dimensional films of carbon preserved on a flat surface of rock. They are most often black in color, reflecting the fact that they composed mostly of carbon (as is coal, which is also black in color). Most fossils that exhibit “soft part” preservation are carbonizations.
I would say the answer is the Carbon remains of the original organism.
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Cellulose
hope this answer helps you...
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the last one is right I think
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xylem is for the transport of oxygen in a plant
I know this because it was in my syllabus last year
