1.A battery cell produces electricity by changing chemical energy into elctrical
2.a noise sends vibrations through the air and brain interperts these vibrations as sound
3.over a long period of time,the minerals replace the bones burried deep in the earth
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1. Electricity is produced by a battery cell by changing chemical energy into electrical.
2. Vibrations sent by a noise through the air and these vibrations be interperted by brain as sound.
3. Over a long period of time, the bones burried deep in the earth be replaced by the minerals.