Thanks for your questions. I’m actually from the UK and have pretty much no experience with the US system of schools and college applications.
I can tell you that I took Biology, Geography and Chemistry in my last year of ‘high school’. I didn’t take physics, but it would be applicable if your studies took you more into surveying the physical aspects of the marine environment. Take sciences, I think is the best advice, whichever they are. But definitely Bio!
At our Universities you apply for a course (e.g. Marine Biology) and you study that course for your entire time there. You don’t concentrate in on a major after getting credits from other classes. So I’m sorry I can’t help you there.
You appear to be able to write, so I don’t think you would need classes? During your time at your college course you should gain experience with scientific writing.
Yes you have to be computer literate, but that’s just life in 2011…and you’re on Tumblr, you should be fine!
No essays sorry. I wouldn’t post it even if I had access to my old essays. Firstly, plagarism is a major no-no in the scientific world. Secondly, the content would only be relevant to my particular course/question/teacher at the time (and it was quite some time ago!)
I wouldn’t ‘narrow it down’ yet. Certainly have the deep-sea in mind, but collect as many skills in as many different areas as possible. This will help keep your career options open.
I get these kind of questions fairly frequently, so check out my journey to marine biology.