Complete the sentence to explain how body parts move.
When muscles contract and relax, the muscles move the attached to them. This results in movement of different parts of the body.

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The truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey