parallel
balances the components in a sentence
Articles or prepositions that apply to all members of a series must be used with only the first in the series or every member of the series.
parallelism
No, "balance" is typically used as a singular noun in a sentence. If referring to multiple balances, it would be more appropriate to use the term "balances" in the plural form.
Example sentence for the noun phrase 'checks and balances':The government uses checks and balances to separate the responsibilities of departments.
Checks and balances is used to by the three branches to check on each other.
No. I think you can come up with a sentence for that. You will understand it better by not cheating.
paralell
The topic sentence, the body with supporting sentences, and the clincher sentence.
Noun and verb
chceks and balances of the executive branch
The system of checks and balances ensures that the government maintains a balance of power.