What is the best definition for a minor character

Minor character definition

A minor character is a character who has a name and does stuff that contributes to the plot, but they aren’t the main characters.

Explanation:

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positive reinforcement? ?

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.