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An explosion that destroys the outer portion of a star is known as a
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Abird flies by moving its wings up and down. which two systems are most directly responsible for the movement of a bird's wings? a. skeletal and muscular systems b. respiratory and muscular systems c. skeletal and digestive systems d. respiratory and digestive systems
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Match each description of an object’s motion with the position-time graph that represents it. not moving moving with constant speed speeding up slowing down
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