Technologist.
of course a technologist
A biotechnology scientist.
I do not know if there is a name for it, but I know that most people who go into robotics are engineers.
Bridgeologist
Technologist.
The name of a scientist that studies sports is called a sports scientist.
of course a technologist
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