Many animals engage in specific behaviors, such as vocalizing and protecting young, that support successful reproduction. True
True

False

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 : )

what type of charge does it have? negative