In a scientific experiment, a__ is any factor that can change or be changed?

Independent

Explanation:

an independent factor is anything in an experiment that is changed. I hope this is what you were looking for.

In a scientific experiment, a Variable is any factor that can change or be changed

Explanation:

In a scientific experiment, scientists observes the change of a factor and its effects on other things. These changing things of an experiment are known as Variables. It is a factor or a condition that can be present in different types.

Variables are of three types - Dependent, independent and controlled variables.

Scientists change the independent variable, dependent variables are observed by them to figure out the response of that thing to that change and controlled ones are constant. Variables that can be measured are widely used by the scientists in an experiment.