Are there any choices to your question? If so what are they? Then I can answer. :)
Answer:
I think that Gravity is not considered a gas but it can at the same time
Explanation:
Gasses are affected by gravity, as above video will prove. ... Yes, there is a attractive force between the gas molecules and gravity !
The rest are for sure gases
Answer:
The invention of the wheel had an important impact on farming.
Answer:
Valence electrons are the electrons in the highest occupied principal energy level of an atom.
