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Annual rings
 
This simulation illustrates the formation of annual rings. Observe eight years in the life of a plant. During winters, alter climatic conditions for the coming year and study how the changes affect the sizes of the annual rings. Under mild conditions the rings are relatively wide, whereas in the more severe years the rings are considerably thinner. Note that as a result of severe climactic conditions, sometimes two thin rings are formed within the span of one year.

 
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