Epidemiology is the science that studies the occurrence and spread of diseases.

I am majoring in political science at university.

I am majoring in physiology at university.

He likes going to chamber music concerts.

He is in the third year of junior high school, or in other words, he is in the 9th grade in school years.

He has a deep interest in numismatics.

He is an expert in molecular biology.

Biotechnology is a science that understands the mechanisms of life and utilizes them.

My brother is a famous biologist.

He is studying classical literature.