Hannah wants to measure the length of time it takes for a mouse's heart to beat fifty times. Which of the following tools would be the most useful for this investigation? A. stopwatch B. thermometer C.

Hannah wants to measure the length of time it takes for a mouse's heart to beat fifty times. Which of the following tools would be the most useful for this investigation?

A.
stopwatch
B.
thermometer
C.
ruler
D.
balance

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Hannah wants to measure the length of time it takes for a mouse's heart to beat fifty times. Which of the following tools would be the most useful for this investigation? A…

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