Proto-Indo-European is considered the origin of many modern languages.

His success had a cause-and-effect relationship with his efforts.

Influenza is prevalent, so don't forget to wash your hands and wear a mask.

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

Economists are concerned about the impact of inflation.

He is studying the theory of intelligent design.

He is interested in the entertainment industry.

His misdeeds came back to him as retribution.

The Intifada is an important event in Palestinian history.

The crab-eating fox is mainly known for eating crabs.