Alternating sugar and phosphate molecules also 4 types of nitrogen bases
Naturally by chemical reactions involving ultraviolet radiation
This would have to do with aerobic and anerobic respiration
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In bacteria, they play an important role in bacterial multicellularity. Cellulose and chitin are examples of structural polysaccharides. Cellulose is used in the cell walls of plants and other organisms, and is said to be the most abundant organic molecule on Earth.
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