Answer is D)Pedometer that's a smart watch people use to keep track with there exercise and heart rate while exercising.
<span>A rain gauge is an instument used to measure the amount of liquid precipitation over a certain length of time. In its simplest sense, a rain gauge is nothing more than a can which collects water which falls from the sky as rain. The depth of the rain can be measured with a ruler.</span>
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Trepanation<span> also known as </span>trephining<span>,</span><span> involves an intentional and planned operation to open the </span>skull.<span> using </span>tools<span> specifically designed for the purpose.</span>
