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Covalent bond.

Actually I think it's hydrogen bonds. I do not believe covanlent bonds contribute to structure at all. Think about the bonds between water molecules. The oxygen atom in a water molecule has a slightly negative charge, whereas the hydrogens have slightly postitive charges. When another water molecule comes along the opposite charges are attracted to one another thus giving the molecules a specfic structure. I don't know if this is a very good example, but it is the easiest way of explaining it without getting into specifics.

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