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Which of the following methods of timekeeping is the least precise?A. Using a stopwatchB. Using a wrist watchC. Counting your heartbeatsO D. Using a calendar

User Metabolic
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It’s c counting your heartbeats

My reasoning is that a wrist watch, a calendar and a stop watch all function on metered, constant intervals of time. A heart beat doesn't. It changes from person to person, from moment to moment. It isn't regular enough to be a precise unit of measure.

User Cristiana
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