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21 February, 18:05

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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Answers (2)
  1. 21 February, 18:22
    0
    A, Stopwatch. A stopwatch measures time.
  2. 21 February, 22:03
    0
    The best answer I'll say it's (B).
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