What did ekman find from his work with the facial action coding system?

The correct answer will be - relationship between facial movements, facial expressions and emotions.

Explanation:

The Facial Action Coding System (FACS) is a comprehensive system used to study the facial expressions and relating them to the emotions.

This coding system was developed by a psychologist named Paul Ekman which is used by the detective agencies to detect lies and the animation industries all over the world.

The system is based on the anatomical facial movement which is broken down into the smaller components called Action Units based on the muscles movements.

Thus, the relationship between facial movements, facial expressions and emotions is the correct answer.