He propounded a theory about the origin of the universe.

The professor provided a clear elucidation of the complex theory.

Darwin's theory of evolution revolutionized the field of biology.

Psychosexual development is a theory proposed by Sigmund Freud.

I will disprove his theory with solid evidence.

The concept of evolution is a derivative of Charles Darwin's theory.

Harmonics are an important concept in the field of music theory.

The practical application of this theory is still under study.

His theory is considered unscientific by many experts.

The professor provided a particularization of the theory during the lecture.