geologist
It is Earth Science!! (:
A seismologist.
Astronomy is the science that studies celestial objects and phenomena in space. Geology is the science that studies Earth's physical structure and substance, as well as the processes that act upon it.
Geology, geography, seismology
Cetology is the branch of marine science associated with the study of cetaceans, which is the order that contains whales, dolphins, and porpoises. Logically, a scientist who studies whales is therefore a cetologist.
While there is no specific science dedicated to poo, if you're a bioscientist, you will probably study it.
The name for this type of scientist is a teuthologist
A scientist who studies animal life is a zoologist. There is no particular name for a scientist that specialises in platypuses.
The type of scientist that studies the environment is an enviromentologist.
what scientist studies hydrogen and oxygen
Geologists study the Earth's interior. They also study the Earth's composition and all the processes that cause it to change.
A botanist.