Which one of the following has a negative charge?, protons, electrons, neutrons, Which one is an insulator?, glass, steel, copper, Which one is a conductor?, rubber, wood, silver, Lightning is an example of , static electricity, current electricity, sound energy, More vibrations per second produce , noise, high sound , silence, is the , kidneys, pancreas, liver, which artery supplies blood to the heart muscle?, aorta, coronary artery, pulmonary artery.

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