Which considerations are necessary to make when selecting and testing a possible solution to a problem? Check all that apply. defining how success will be measured
defining what a successful outcome is
specifying how long a solution will be tried
using multiple solutions at the same time
trying only one solution at a time

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As cell after cell rapidly transmits the electrical charge, the entire heart contracts in one coordinated motion, creating a heartbeat. ... The SA node (called the pacemaker of the heart) sends out an electrical impulse. The upper heart chambers (atria) contract. The AV node sends an impulse into the ventricles.