True: studying a kidney model can save time,money and effort, cobalt is an example of magnetic material , the natural pacemaker inside our heart creats electrical currents to make it contracts, False: Excretion process is necessary to convert complex food into simpler substances , The magnet is surrounded by an area called magnetism in which the magnetic force of magnet appears , Magnetism is a pulling and pushing force, while gravity is a pushing force only, the insuline pump device helps diabetics control the water level in the blood with automatic injections of insulin ,
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