One of the scientists who first discovered fission is a. Henri Becquerel.
b. Marie Curie.
c. Hans Geiger.
d. Enrico Fermi.

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 : )

as a general rule, scissors have blades less than 6 in (15 cm) long and usually have handles with finger holes of the same size. shears have blades scissors used to cut hair or fabric must be much sharper

the amount of current in the coil

see earlier answer