State two factors that are seriously threatening the marriage institution

Children, and alcohol

Explanation:

Children are often the cause of divorce, because of the favoritism that some families have going on, and alcohol is also threatening the marriage institution because of the problems that families have. Things like rehabilitation and and therapy are the cure for these type of things, however, marriage can also be damaged if the person resorts to alcohol, meaning that the problem is actually the family itself.

- "the basic difference between keywords and subjects is that subjects (or "subject headings") have been predetermined, while keywords have not. a keyword is an easy place to start because you can use any word that seems to fit your search; this is called "natural language" searching."