What is one important characteristic of all human systems

The ability to function and for chemical processes to occur

Language

Explanation:

It is regarded as the characteristic of the logic, is often seen to be the single dynamic aspect in all the human systems. Human systems under this view are linked to that of the development of the logic'. However, logic has not always been considered coherent.

Iwould say d. eye contact and body language because you aren’t using any spoken communication. hope this : )