The House of Representatives is based on population.
Not sure what you mean here
The sentence that uses the passive voice for the main verb is: When we can pick our reading, mythology is most often chosen in my class. When a sentence is written in the passive voice, the subject becomes the receiver of the action. The subject in this sentence is "mythology" which receives the action of "most often chosen".
3 maybe if no 4
3 I think so
Bittman's style tells me that he likes to cover every point and is very precise. He makes sure that everything is mentioned and also tells you the benefits and obstructions of the decisions the could be made.