It refers to the ways scientists explore and study the world based on observations and their works/ evidence.
The pressure will increase with decreasing volume. if they remain constant, that is.
Ammonium acetate:
Formula C2H7NO<span>2</span>
Krypton-84 is the most abundant type of Krypton. The answer is C.
If you need this to be explained, I will do my best it's a bit difficult to say how to find it out, but I will if you need me to.