Reading this supplementary explanation will deepen your understanding.

The complement system of the immune system plays an important role in eliminating foreign substances in the body.

He is an atheist, denying the existence of God.

He is reading a book about the theory of evolution.

He strongly supports realism in philosophy.

Phonology is a branch of linguistics that studies the system of sounds and their functions.

Whether his new recipe is really delicious or not, the proof of the pudding is in the eating.

He proposed a new theory about cosmology.

He believes in the philosophy of monism.

He is an expert in cryptography and is involved in the development of security systems.