in the laboratory
She was a Marine biologist.
scope of practice
No, you do not capitalize marine biologist in a sentence. (Unless marine is in the beginning of the sentence)
No. We practice a profession, in which we may exercise our abilities.
He was a glover. Not really a profession, more of a trade.
in hospital
Law.
in the sea
Hospitals
They practice the profession of seismology.
All three expressions are correct, but they are used in different contexts. Follow a profession – means you work in or practice that profession. Example: "She follows the teaching profession." Take up a profession – means to begin or choose a profession. Example: "He took up accounting after graduation." Enter a profession – commonly used when someone starts working in a professional field. Example: "Many graduates enter the IT profession every year." Other natural collocations include: Choose a profession Practice a profession Pursue a profession Build a career in a profession So, if you're talking about starting, "take up" or "enter" is more appropriate. If you're talking about working in it over time, "follow" or "practice" fits better.
it helps me do my proposals