Marine Biologist
Marine biologist are people who study live things in the ocean. includes everything from small organisms such as plankton right through the very large such as whales. the subjects to become a marine biologist are important because they include biology, physics, chemistry and mathematics. As part of their job, a marine biologist may collect and analyze biological data, study plant life, identify animal species , research environmental effects, communicate findings to the public and much more. If you want to become a marine biologist you have to love the out doors including the ocean because the ocean covers about 71% of the earths surface.

Salary
The average salary of a Marine Biologist is $77,630. but the Salaries start from$39,700 and go up to $124,680.
here are some links below talking about how and what marine biologist do at work .
http://marinebio.org/oceans/creatures/