Search it up luv. It will help you a lot more
In the sentence "the new bakery opens <u>in</u> a week" you only have the preposition IN. A prepositional phrase consists of preposition plus a noun, pronoun or gerund working as the object.
So, the prepositional phrase is "in a week", the object of the preposition is "week" (a noun) which is pre-modified by the indefinite article "a".
Answer:
the plot is the sequence of events where each affects the next one through the principle of cause-and-effect.
That would be a noun because it's a person stating it.