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A tree is a living structure in nature that has undergone 9 or more levels of fractal complexity.
 
 
 
 
 

Tubers are swollen regions of stems that store food for subsequent growth. The potato is an example. It is a stem because it has many nodes called eyes with spaces between eyes known as internodes. Potato tubers develop at the end of swollen underground stem structures, rhizomes.

Eyes of potatoes are really axillary buds which contain several small buds at each site. These buds can expand to form shoots which grow on to make whole plants. Although the common potato is a stem, the sweet potato is a modified root!