biology
The Italian word 'biologia' is used in much the same way as the English word 'biology'. It is a noun that refers to the scientific study of life and living organisms. It is often used in educational and scientific contexts.
I have a biology book on the desk.
This sentence is talking about a biology book that the speaker has and it's currently located on their desk.
Biology is one of my favorite courses at university.
In this sentence, the speaker is expressing their preference for the biology subject among their university courses.
My sister studies marine biology.
The speaker is stating here that their sister is studying a branch of biology, specifically marine biology.