The sentence from the passage with the statement that explains how the author's thesis was developed include:
Introduces the author's thesis - Other studies show that playing an instrument improves critical-thinking and socializing skills."
Provides evidence in support of the author's thesis - Therefore, because music programs improve student grades, enhance critical-thinking skills, increase college graduation rates, and remain relatively inexpensive, we should not cut music from our schools.
Restates the author's thesis - "However, these programs provide valuable resources for students."
The thesis simply means the statement or theory that's put forward as a premise which is to be proved.
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