The use of a colon in this sentence is correct because a) colons can be used in place of a period. b) colons and semi-colons are interchangeable. c) colons separate two independent clauses into sections in the sentence. d) colons should be used after independent clauses that come before lists.

The use of a colon is correct because D) Colons should be used after independent clauses that come before lists.

An example of this is: My favorite colors are: blue, green, and purple.

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last one is the answer

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.