6 Which of these is best assified as a mixture?
A. Carbon dioxide
B. Water
C Soil
D. Iron
(help please and explain if you can)

soil

Explanation:

The dirt is made by many materials, like rock, sand, gravel.

hope this helps!

I'd say soil

Explanation:

because it has many different things in its composition like sand,rocks and some times even bones

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.