Which of these is something stage directions typically do

A. Describe sound effects.

Explanation:

Stage directions are observations, instructions, and recommendations written by the author to allow the director and the actors properly interpret the play; that is to say, they are instructions on how the actors should move on stage, how they should read their lines, how they should enter and exit a scene, and, also, what sound effects are most adequate for each moment in the play.

squash

explanation:

the gas pressure p, gas volume v, and gas temperature t are given in the formula:   pv=nrt,

r is the gas constant, and n is the number of gas moles.

if the container is cooled and remains under atmospheric pressure, where r is a constant that does not change, the volume of the container remains the same, the conclusion is drawn that, with all other values ​​unchanged, the number of gas moles n, is decreases.

the right answer is a.