1.The fog is not permanent it moves it stays only for a moment as in the last sentence it moves on.
2. D a metaphor it using the cat as a metaphor for the fog.
I will defeat you yelled the man too
I believe it is a simple present sentence.
Answer:
a mark or character used as a conventional representation of an object, function, or process, e.g. the letter or letters standing for a chemical element or a character in musical notation.
or...
a thing that represents or stands for something else, especially a material object representing something abstract.
hope it helps;)