A sentence fragment is a sentence that cannot stand on its own because it is incomplete and lacks an independent clause. So, the answer is "Tiny, weightless crystals." It's an incomplete sentence. To make it complete, you can rewrite it as "The snow is like tiny, weightless crystals."
1. Sarcastic “so called” shows that what the American dream is not what it is said to be
Was there a text given for the second question? What was it based on?
The correct answer should be A. subdivisions
Usually, they are split into numbers for the highest and broadest rank, then capital letters for subdivisions, and then lower case letters for the lowest place in the hierarchy.