A Marine Scientist studies the ocean and its ecosystems, focusing on the life forms that inhabit marine environments. They explore various topics, including marine biology, oceanography, and marine ecology, to understand how these systems function and how they are affected by human activities. These scientists often conduct research in the field, collecting data through methods like diving, sampling, and using submersibles. Their work helps inform conservation efforts and policies aimed at protecting marine habitats and species, such as coral reefs and fish populations.