Answer:
The cities in Ancient Greece were separated by hilly countryside. All the cities were near to water bodies. Rome was an inland country and situated on the banks of River Tiber. Greek art was considered to be superior to that of Roman Art.
The main similarities between Greek and Roman political structures were that both empires were made up of several city-states, both believed that the citizens needed to actively participate in politics and military service, and both favored aristocratic rule.
Explanation:
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The lightbulb affected peoples lives most because people were able to stay up past sundown, and work longer hours.
The correct answer to this open question is the following.
Although the question is incomplete because it does not provide a specific reference about the author of the letter or any other reference, we can comment on the following.
A primary source is the piece of information that was written by a character or an individual that lived in the moment of the event, was part of the event, or witnessed the event. This individual could have written a letter, or a document -including a book. Or he/she took a photograph. Or was part of an interview. The secondary source includes information from a third person who was not part of the time or event but has found information through other resources. It is the case of an encyclopedia or researchers/historian books.