Advice on career

First Off, I'm Dutch so my apologies for any grammar/spelling mistakes (feel free to correct them). I've made a combined post of two questions, but I though it might be better to make two different posts.

I could use some advice on choosing a career.
I have an interest in many different thing like:
* Exploring new forms of life, either in our own oceans or potentially other planets
* Bio engineering, medical technology like prosthetic limbs
* Studying the brain, doing research on mental diseases or just different brain function in general

Maybe something else in those directions. Can somebody tell me what type of education and which specific jobs would fit those directions? (No need to explain in details, if I have names, I can google it)

Any advice would be much appreciated.