What is the predictable motion of a wheel? How did the predictable motion of wheels enhance transportation

Explanation:

Because wheels are round, the distance between the ground and the wheel's axle through the center is constant.  This means the wheel will roll rather than slide.

Since there's much less friction in rolling compared to sliding, wheels allow us to transport heavy loads with much less force.

i guess that visual aids present persuasive examples to what you are presenting, some factors would be theme (does it fit with the color, information, what you are presenting), size (can you see it, is it a big enough span of data/information), and overall look of the visual aid.

hope this : )

their crystal patterns have been disrupted by stress