C. The platypus, which is a mammal, has a bill like a duck and feet like an otter.
"which is a mammal" is an adjective clause. An adjective clause is used to describe a noun and usually begins with one of these words: that, when, where, who, whom, whose, which, and why. In this sentence, the adjective clause begins with "which" and describes the platypus, which is a noun.
Well, since jaunt and excursion mean relatively the same things, they are near synonyms, we are looking here for a word that has a relatively similar meaning to that of 'resignation'. Since you didn't give us any examples, I will just list you some of its synonyms: departure, retirement, termination, abdication, leaving, notice, abandonment, withdrawal, etc.
No, it is generally not true that when summarizing the of a plot, that one should notice the key ideas about how the conflict builds, since plot summaries depend less on why conflicts occurred, and more on why they occurred.
I think the answer is commas.
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