The main reason why you would use the revising strategy called Use Snapshots is because snapshots are some of the easiest way to catch and contain lots of material, especially on a computer desktop.
Perhaps defying fate or the universe to be with Juliet?
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.
It's called that because it was one of the first streets in New York City to be lit with electric lights. People continue to use this term today because the millions of lights on the theatre marquees still brighten up the night sky in a flashing white.