Why do the rules for marking stress and intonation keep changing? Don't we have any fixed rules?

On one hand, i aspire to an ivy league vocation: 1 professor of the sciences in higher education. 2 but like noble amphibians that thrive on land and in the stream, 3 i've got another world of which i like to gladly dream. 4 some say that it's abnormal; my affections are exclusive. 5 in science, they say, emotions are something quite elusive. 6 line 3 exemplifies which kind of figurative language? a) hyperbole b) metaphor c) onomatopoeia d) simile

The point of view that london uses in white fang the reader understand the perspectives

Which form does a verb take when the subject receives the action? passive active imperative indicative