1. Do you think that the lightbulb and the Moon spheres are "to scale" compared to the real sizes of the sun and
the Moon?

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

it would only be the stuff in module eight so you need to study all the lessons in that you also could check the flvs

hope this : )

the answer is d. matter from the air combined with the steel wool.