The two choices which correct the run-on sentence are-
Hamster experiment - The hamster consumes the carrot first before receiving chemical energy. The hamster now "transforms" the chemical energy into mechanical energy by spinning his wheel. Given that the mechanical energy is now coupled with a generator, the wheel's rotational motion is being transformed into electrical energy. And since we already know that this electrical energy powers a light bulb, we can see how it changes into radiant energy.
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