Write a compare-and-contrast analysis to compare the way two different texts present similar ideas.

Compare: Estimate, measure, or note the similarity or dissimilarity between.  

Contrast: Compare in such a way as to emphasize differences.

Therefore, to contrast is to compare. They mean the same thing. So, just write the differences and similarities between the two texts and you should be fine. It doesn;t matter what subject or topic it is, just stick to the guidelines..

16

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.