Which of the following is an example of how a scientist might use a model

a. marbles placed inside a hollow sphere are used to describe protons in a nucleus

b. stopwatches measure the amount of time it takes for runners to complete a mile

c. microscopes are used to magnify a group of cells on sets of slides

d. a wrench is used to tighten a nut onto a piece of wood

A. Marbles placed inside a hollow sphere are used to describe protons in a nucleus.

it would be A because the other options are just the tools used in an experiment and A is actually using other objects

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.

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