Provide one reason that leads psychologists to believe personality changes and one reason that leads psychologists to believe personality remains stable.

Personality remains stable depending on situations and age.  If a young child experiences a traumatic event there's a possibility of it affecting the child's persona in a negative way. Pretty much everyone could be a victim to a personality change if they went through a life changing event. Personality will remain stable if the person is healthy, and in a decent mental state.

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The Sample answer given on Edg. is:

Psychological research indicates that personality seems to be malleable or changing as one experiences child and adolescent development, but aspects of personality, such as one’s temperament and emotionality, seem to remain stable into adulthood.

ground wouldnt be clean and the soap wouldnt be dirty