Why is a doctor not better than a teacher?

because doctor help save lives and teacher is there just to teach each of its own

d) the narrator even suggested that the white whale, moby d, was ubiquitous and present in every ocean at every moment.  

hello,

your answer is a) the metaphor suggests that the poetic themes are serious and dark.

collins is comparing the poem to a dark room. he is suggesting that the poems theme is serious and wants you to understand it. you don't need to understand the poet in order to understand the poem. you also don't need to move around while reading it. he is simply saying the poem has a dark and serious theme.

- i.a -