Which punctuation is used to separate certain compound words? A. apostrophe
B. comma
C. hyphen
D. parentheses
E. quotation marks

i'm not sure what the second paragraph is but a decree is an official order issued by legal authority. find the one that best fits this definition.

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.