A unit cell is the most basic and least volume consuming repeating structure of any solid. It is used to visually simplify the crystalline patterns solids arrange themselves in.
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Vishakha Goyal answered this
polymorphism is the ability of a solid material to exist in more than one form or crystal structure.
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Priyanshi Naskar answered this
Anisotrophy refers to the property of a crystal solid to have different physical properties like refractive index etc, in different directions.
Unit cell is the repeating unit of a solid.