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What is the name of a person that studies organisms
An entomologist is a person who studies insects.
A person who studies sand is known as a psammologist.
A person who studies sound is called an acoustician.
What is the name of a person that studies derivation of
A person who studies audiology would be called an audiologist.
A horologist studies time.
mr. djw studies dinos
Etymologist
chiropterologist
zoologist
A dietician.