What do wind turbines, hydroelectric dams, and ethanol plants have in common? A. All produce electrical current without pollution. B. All use generators to produce electrical current. C. All convert gravitational

What do wind turbines, hydroelectric dams, and ethanol plants have in common? A. All produce electrical current without pollution. B. All use generators to produce electrical current. C. All convert gravitational potential energy to electrical current. D. All convert thermal energy to electrical current.

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