What two universal factors or experiences make the variety of human behavior comprehensible?

The emotions and hormone levels.  

Explanation:

Human behavior is complex and difficult to analyze. For many years scientists have had difficulty knowing which factors make the variety of human behaviors understandable, since the great difficulty in analyzing behavior is the wide variety of different behaviors present in society. After much research it has been found that the factors make understandable the variety of human behaviors are the emotions and the hormone levels.

Human behavior is best evaluated by hormonal and emotional levels, as these factors reveal the kind of education received by parents and teachers, as well as the biological influences of the human organism.

Depending on the upbringing received during childhood, people develop behaviors and temperaments that combine with self-esteem, discipline, the ability to solve problems in a less conflicting way or not. This is also influenced by the deficiency or large amount of some hormones.