A chemist
A scientist that studies fungi is called a mycologist.
A person who studies carbon chemistry is called a carbon chemist or an organic chemist. These scientists focus on the structure, properties, and reactions of carbon-containing compounds.
A scientist who studies gems such as rubies and diamonds is called a gemologist. They are experts in identifying and evaluating the quality and characteristics of gemstones.
A scientist who studies DNA double helix is called a molecular geneticist or a geneticist specializing in molecular biology.
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 person who studies physics is called a physicist, a person who studies chemistry is called a chemist, and a person who studies biology is called a biologist.
A biotechnology scientist.
An Oceanographer. Marine Biologist, that sort of thing.
A scientist that studies viruses is called a virologist.
A scientist who studies mollusks is called a teuthologist.
A scientist that studies bears would be called an ursinologist.
virologist
An aviologist.
Bridgeologist
astronomer
A meteorologist.
biologist