That person would be called a scientist
A scientist that studies animal life is a Zoologist.
The Person Who studies about mamals , he is called mamalogist....
A person who studies volcanoes is called a volcanologist.
A person who studies the grass and soil, etc. is called a Agrostologist
A person who studies or writes history is called a historian.
A person who studies geology is a geologist.
A person who studies culture is called an anthropologist.
a biologist
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zoologist
A person who studies bees is called an apiologist.