Please help me I really can’t figure it out.

Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work)

Plz ! for many generations farmers in north america have been choosing to cross corn plants with large ears of corn each year this results in the new generation of plants also growing large ears of corn. what is the technique called? a. selective breeding. b. natural selection. c. mitosis. d. asexual budding.

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