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Select the choice that best completes the following sentence. Simple machines A. cannot be combined to make compound machines. B. are tools that make work easier. C. reduce the amount of energy needed
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Select the choice that best completes the following sentence. Simple machines A. cannot be combined to make compound machines. B. are tools that make work easier. C. reduce the amount of energy needed to do work. D. are made up of multiple moving parts.

User Roberc
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B because machined make work 2x more work or higher

User Tom Hennen
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