Air conditioners have filters. What are they
used to separate and how do they work?

Explanation:

there are three different filters

captures particles as small as 0.3 microns

captures medium sized particles and absorbs gaseous contaminants

captures large dust bunnies, large pollen, pet and human hair and helps preserve charcoal and HEPA filters

hope this helps :)

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

i would say b

explanation:

but i think i would need more information than that