And because they essentially are located adjacent with respect to one another, we have these hydrogen bonds shown in purple. Now, because we have a distance of 3.4 angstromes between any base pair, and because this distance corresponds to Vander valve forces, that means we have a bunch of London dispersion interaction taking place between our bases. So these bases are basically stacked on top of one another. And because this distance of 3.4 angstroms is the perfect distance for London dispersion forces, that means we also have these Vandervile forces holding our bases together and contributing to the overall structure of the DNA molecule. And finally, we also have the hydrophobic effect and the hydrophobic interaction. So remember, inside the nucleus of ourselves, we have an aqueous environment that consists of the water molecule.