The gradual decline in men's testosterone levels in middle age can reduce their sex drive
It sends an electrical impulse to make your heart beat. The job of a pacemaker is to artificially take over the role of your sinus node if it isn't working properly. Electrical impulses are sent by the pacemaker to stimulate your heart to contract and produce a heartbeat
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None because they are children play toys not scientific tools!
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<span>Enzymes cut introns out of an mRNA strand.</span>
