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The author of the passage explains the process by which a supersaturated solution is created in order to
We know that a supersaturated solution contains more dissolved solute than a saturated solution, but we also know that a saturated solution cannot absorb more solute. The author resolves this seeming paradox by telling us about the special circumstances required to create supersaturated solutions.
Although the author mentions that supersaturated solutions are volatile, the process by which they are created does not tell us why this is so.
Even thought the author tells us in the fourth paragraph that supersaturation plays a role in polymorphism, we do not need the details of how a supersaturated solution is formed in order to understand polymorphism.
We do not learn anything about the properties of a supersaturated solution from the author's description of how one is created; hence, this cannot be the function of this explanation.
The author does not state or imply that creating a supersaturated solution is difficult so this cannot be the function of this explanation.