We compare same category with than.
She is the subjective case of pronoun.
I is the subjective case of pronoun.
She answered more questions than I.
Generally, either is followed by or.
Neither is followed by nor.
Not only is followed by but also.
In the above sentence, the main subject of the sentence is size which is singular.
Each is used for two or more than two.
Every is used more than two.
Each is used for individual.
Every is used for collection or group.
Here of is a preposition.
Subject is used before preposition.
Subject must be a noun or pronoun.