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Speleologist .
An Ecologist is a scientist who studies ecosystems.
A scientist who studies the earth and what it is made of are geologists
A geological scientist studies rock and stones.
Soil scientist
What do you call a person who studies floods
The name of a scientist that studies sports is called a sports scientist.
An arachnologist
A scientist who studies crystals is known as a Crystallographer.
A scientist who studies animals is called a zoologist.
A scientist who studies animal life is a zoologist. There is no particular name for a scientist that specialises in platypuses.
An archaeologist studies artifacts and remains from past cultures.
The name for this type of scientist is a teuthologist
This answer is a entomologistA scientist who only studies fish is called an ichthyologist.
environmentalist
ecologist
Astronomer