<p>What the title says.</p>
<p>I'm interested in Zoology or Marine biology, but I'm not even in college yet so my plans will probably change.</p>
<p>You’re planning too far ahead. I’m guessing you’re trying to just pick a college major? Pick whichever seems more interesting. You’re a long way from a biology PhD. And “biology” is far too generic when thinking about PhD programs - you apply with a specific research interest and that’s what you spend most of your time on.</p>
<p>Don’t worry about that yet, though. Pick whichever of those majors appeals to you for its own merits and worry about grad school in a couple of years.</p>