Science

Which of these is the best definition of a compound machine?

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What type of simple machine is used on a flag and flag pole?
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Which of these is a type of wetland?
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How many times more does Jupiter radiate energy than what it receives from the sun?
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Which Apollo mission was launched on December 21, 1968, and spent Christmas in lunar orbit?
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About how often does Halley's Comet return?
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