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<p>The problem is that the supply of biology graduates is very large. In some schools, biology is the most popular major. This may in part be due to all of the pre-meds who mistakenly think that they have to major in biology (or do so out of convenience), but do not get into medical school (which is most of them). Chemistry graduates suffer also, since they seek many of the same jobs as biology graduates.</p>
<p>The science majors with better job and career prospects are the more heavily math-based ones, like math, statistics, and physics. There is far less of an oversupply, and oversupply is usually recruited into good paying jobs in finance and the like.</p>