Which sentence is an example of how a scientist might use a model? A. A wrench is used to tighten a nut onto a piece of wood.

B. A microscope is used to magnify a group of cells on a slide.

C. A stopwatch is used to time the rate of a chemical reaction.

D. The end of a slinky is moved vertically up and down to simulate a wave.

D. The end of a slinky is moved vertically up and down to simulate a wave.

Explanation:

A Slinky is a compact helical coiled toy that can perform many number of tricks such as stretching it-self and come back in its original shape.

A slinky here is used as a model by a scientist to stimulate a wave or to understand the concept of the wave. To study the nature of waves, slinky is used to create waves by moving vertically up and down that leads to the vibration or disturbance in a medium.

Hence, the correct answer is "D. The end of a slinky is moved vertically up and down to simulate a wave."

nanotechnology is a powerful tool in biomaterials research as it creates numerous possibilities for the engineering of functional molecules. nano-bio refers to projected ability to incorporate biomimicry into various materials at nanoscale.  

a c d and f

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