answer:It sounds to me like you have a very well thought out plan. Any of the scientific disciplines you described should provide a strong foundation for critical thinking skills, even if you don’t end up as a physicist, marine biologist or neuroscientist. Definitely pursue what interests you the most. I majored in chemistry, and went on to study medicine and immunology after that. I loved being a chemistry major (though in truth, I didn’t quite love physics). In particular, I focused more on biological chemistry (a bit more chemically oriented than biochemistry, but this is semantics). I feel that the rigorous training I received as a chemistry major definitely helped with my future career. Certainly if you want the most fundamental training, then pursue physics. Physics is what makes everything work, and so you can eventually apply that to pretty much any discipline. But, this is just my two cents. The bottom line is that you have listed a great set of options, and you have the luxury of time to decide what you want. I am sure that the introductory classes will help narrow your focus, and in the meantime, your “entry-level” science classes (calculus, physics 101, chemistry 101, biology 101, etc.) will provide the foundation for any of your choices. Good luck, and enjoy!