He is an expert in astrophysics.

He is an expert in molecular biology.

I am majoring in developmental biology at university.

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

He is an expert in nuclear physics.

My brother is a famous biologist.

He is interested in paleozoology.

He is in his unlucky year, so he needs to be particularly careful.

My signature is required on this contract.

He is traveling around the world in search of the elixir of life.