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

D Microscopes

because they use them for DNA

a,b,and c, all you an item that can be used and not tested with.

The answer is 100% A

The slinky is the model... it simulates a wave.

A wrench, stopwatch, or microscope is not a model.

the child will have heterozygous dominant chromosomes as characters of his father are dominant over the characters of his mother.

the child is heterozygous

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.