Which of the following is an example of how a scientist might use a model?
A. The end of a slinky is moved vertically up and down to simulate a wave
B. A wrench is used to tighten a nut onto a piece of wood
C. Stopwatches measure the amount of time it takes for runners to complete a mile
D. Microscopes are used to magnify a group of cells on sets of slides
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