A catalyst
Something that causes an involuntary action
A stimulus is something that causes a response in an organism, such as a change in the environment that triggers a reaction. It can be internal or external and can be physical, chemical, or biological in nature. Stimuli play a crucial role in triggering behaviors and adaptations in living organisms.
It is something that causes or contributes to a change.
It is something that causes or contributes to a change.
Change is already a verb. For example "to change something" is an action and therefore a verb. Another verb is exchange. As in "to exchange something for something else".
stimulus
hi
Erosion is something that causes the earth's landforms to change.
yes
A catalyst is something that causes change. Therefore any present, such as an engagement ring, that causes a major change in your life could be considered a catalyst.
an independent variable
Effect is something that is produce by a cause or the result of an action.