Read the first stanza of "auspex."

my heart, i cannot still it,
nest that had song-birds in it;
and when the last shall go,
the dreary days to fill it,
instead of lark or linnet,
shall whirl dead leaves and snow.

the speaker compares his heart to an empty nest in order to
emphasize the fact that his love has left.
describe a physical feeling he is experiencing.
illustrate the positive qualities of his love.
explain the types of birds that he favors.

The correct answer is: To emphasize the fact that his love has left.

The fact that the author describes his heart as a nest must mean it had, metaphorically speaking, space for himself and a bunch of other individuals - represented by song-birds.

The previous statement might make reference to the feeling of letting one's offspring (children) go once they've grown big enough to leave home and look after themselves. This claim is evidenced by the author's statement about "The dreary days to fill in" which will happen "... when the last shall go", referring to the birds leaving the nest.

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.