Which statement accurately contrasts archaebacteria with eubacteria? Only archaebacteria live in the human body.
Only archaebacteria can live in extremely salty waters.
Only eubacteria live in the human body.
Only eubacteria can live in extremely salty waters.

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 : )

answer: a) y=-8x+5

a) m= -8

b) m= -2

c) m= 7

d) m= 6

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me