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OpenStudy (anonymous):
Simple tools made from simple machines were developed and invented by people thousands of years ago in order to: a. Make their life easier b. Help them do their work. c. Have more effective transfer of their energy. d. All of the above.
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OpenStudy (anonymous):
I think D
TheSmartOne (thesmartone):
Why do you think D? Also no direct answers please @kaylanicole1797 Also read the CoC: http://openstudy.com/code-of-conduct Thanks
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