A geneticist or molecular biologist.
A scientist that studies fungi is called a mycologist.
A chemist
If you mean what do you call a scientist who studies earthquakes, that would be a seismologist.
A person who studies logic is called a Philosopher.
They would probably either be an Atmospheric Scientist or an Oceanographer if they were studying the phenomenon itself, depending on which aspect they're looking at.
A double helix.
A scientist that studies fungi is called a mycologist.
A biotechnology scientist.
A scientist who studies history is typically called a historian. Historians analyze and interpret past events, cultures, and social behaviors in order to understand the development of human societies over time.
An Oceanographer. Marine Biologist, that sort of thing.
A scientist that studies bears would be called an ursinologist.
a scientist who studys cells are called what
virologist
A meteorologist.
An aviologist.
biologist
astronomer