Which characteristics are used to classify stars on the Hertzsprung-Russell diagram? Check all that apply.

size
density
composition
temperature
absolute brightness

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 answer is b

explanation:

spectral lines lyman is one set

wavelength divides in half and speed stays the same.