The sun keeps all of the planets orbiting it because

the law of universal gravitation states that an increase in mass causes an increase in gravitational force
the law of ellipses states that the planets orbit the sun in circular patterns
the law of harmonies states that the motion of the planets will not stop unless an outside force is applied

a) the law of universal gravitation states that an increase in mass causes an increase in gravitational force

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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.

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false

explanation:

boats, things on boats luggage are way more heavy then water.