<p>I put 'Biology' on application, but I changed my mind. Should I call the admission office about this? Should I do nothing because it's not a big deal? Oh yeah, one more question: Can you do double majors? Because I am stuck between two subjects I really love.</p>
<p>The admissions office doesn't care what you finally decide to make your major at all. Don't call them, it's not important.
And yes you can double major. some of the links on this website talk about double majoring I think. Just remember, especially for a science major, one major is plenty to handle at times. <a href="http://www.aas.duke.edu/trinity/t-reqs/%5B/url%5D">http://www.aas.duke.edu/trinity/t-reqs/</a></p>