Tangible items or pictures used by scientists to represent invisible processes are called

Tangible items or pictures used by scientists to represent invisible processes are called Scientific Models

Explanation:

Scientific models can be both physical or non-physical and help to represent a theory or natural phenomenon. An example of a physical scientific model cab be the globe or an Orrey (model of the solar system)

Non-Physical scientific models consist of mathematical models or even economic models that can help to predict something or clearly present a theory.

A scientific model helps to present and explain an idea and apart from just students and it can be equally useful for professionals.

answer; gender,race,age,/// (d) all of these;

answer; black& white dialogue;