A gerund is a verbal form that ends in -ing (for example: sleeping, singing, etc.). Here, you are looking for a phrase, which means you are going to include additional words to the gerund. The correct answer as to what the gerund phrase in this sentence is is keeping wild animals for pets.
Yes, the statement given is a sentence fragment because it contains neither a subject nor a verb.
The answer that describes the poetic technique used there is enjambment. The line "Ah, when she moved, she moved more ways than one:" is an example of an enjambment. An enjambment is <span>the continuation of a sentence without a pause beyond the end of a line, couplet, or stanza.</span>
A theme is a central topic, subject, or message within a narrative