In 1900,the most commonly used source of energy in the United States was ________;today it is ________. 
Definitions:
Volunteer
A person who offers services or work for an organization or cause without expecting monetary compensation.
Life Review
A therapeutic process often used in counseling or psychotherapy that involves reflecting on past experiences and significant life events to gain insight or achieve resolution.
Long-term Care
Services and support provided to individuals with chronic health issues or disabilities over an extended period.
Failed Marriage
A marriage that has ended in separation or divorce.
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