Different theories and laws can end up to be wrong, and must be tested by considering what evidence we should find if the theory or law were false, and then looking for such evidence. For example if the theory of evolution were false then we shouldn't expect the similarities between living things to show a nested hierarchy, where in two species share many similarities some of which are shared by more distantly related species, and some of those of which are shared by more distantly related species; etc. Since we do in fact find such nested hierarchies of similarities, and since we would not expect to find such hierarchies if everything were made from scratch to look as it does now, that is strong support to indicate the theory is correct
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