Good afternoonfrom bangladesh

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 : )

the body's situation won't change the forces are equal opposit and on the same body

their crystal patterns have been disrupted by stress

number of electrons for neutral cl