What are some factors that all people have in common regardless of differences in background

The factors that all people have in common are: cells, tissues, organs and systems.

Explanation:

All human beings are made up of various organs and systems that work together to ensure the perfect functioning of the organism. If we look at the microscopic level, we can see that all human cups have in common the presence of thousands and thousands of cells, which make up tissues, organs and systems, which allows us to say that humans are multicellular organisms. For this reason, we can say that the factors that all people have in common, regardless of historical differences are:  cells, tissues, organs and systems.

you aren't worthless, you are a one of a kind person who, deserves happiness like anyone else, you may not get it but everyone deserves happiness. i hope this .