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<p>Most universities’ breadth requirements in science (if any) can be fulfilled by easy courses for non-majors. Only at a few schools, like MIT, do H/SS majors have to take the “real” introductory science and math courses for their breadth requirements. Some schools, like Brown and Amherst, have no breadth requirements at all.</p>
<p>It is generally pretty rare for H/SS majors to take science courses intended for those majoring in those subjects, unless they are pre-meds in biology, or they start as STEM majors but switch to H/SS later.</p>
<p>On the other hand, H/SS departments typically offer only courses suitable for majors, so STEM majors typically have to join H/SS majors in their breadth courses. However, some of those H/SS courses are less rigorous than the could / should be, and some STEM majors do seek out those particular courses.</p>