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This has two misconceptions.</p>
<p>1) Coursework and majors aren’t everything. The marine science/biology combination at Miami is more than sufficient for your needs, particularly since it requires the physics/chem/math courses you need for grad school. If you want to take additional science courses, feel free, but there is no need to add another science major. As iTransfer said, research would be MUCH more beneficial. </p>
<p>2) I strongly discourage students from attending the same school for graduate studies. Selecting a different school exposes you to (slightly) different research, different research/teaching approaches, and gives you a larger networking pool. Additionally, Miami is not quite as highly regarded at the graduate level as for undergraduate, where it’s certainly tops - though it is still excellent, of course. MIT and Scripps are the gold standard for oceanography, though naturally it depends on your subfield (e.g. URI and Texas A&M fit my own interests better). </p>
<p>Remember that college is the last time you’ll have access to such a broad array of classes, so take advantage of that. Rather than stacking on an additional science major, which is overkill, try learning a new language or taking a course in economics or philosophy. Miami has a lot to offer its undergrads.</p>
<p>sschoe2 is unfortunately correct about the job prospects for marine biology. The job outlook is reasonably decent if you have an interest in the hot topics right now (fisheries management, applied ocean science like seaweed research, climate and microfossil research, etc.), but certainly the jobs most people would like (vertebrate or mammal biology, aquarium management, etc.) are relatively few and far between. That said, I’ve never been one to warn students away from a field they love – I would be absolutely bored to tears doing business or engineering, and I’m sure many others feel the same.</p>