I believe they are both equally friendly. It all depends on size in my opinion. My friend owns a Shar Pei and it's his best friend.
The answer would be A. a virus
The question states that the blood was filtered thru a porous material that prevented <u>all cells </u>from passing thru.
All of the options are cells except viruses.
Hope this helps:)
The heart, lungs, blood vessels, and blood
You can't really expect to find water stored as a gas, as it cools to a liquid at room temperature. You could easily find evaporated water on a stovetop by boiling water, though.
