How does the use of metaphor contribute to the effectiveness of this argument? I realize that allowing ComCorp to erect a cell phone tower next to the high school will bring our town thousands of dollars. But until we know the full details of the safety this operation, we must stand firm against its construction. This proposal is a trojan horse waiting outside our city walls, and we cannot bring it inside until we see what is hidden within.

faulty parallelism is a grammar construction where there is no balance in the parts of a sentence they have a similar meaning but the grammar structure is not equivalent.

the correct version of this faulty parallelism in the sentence is:

jefferson wrote the declaration of independence, and he was the nation's third president.

the problem with the first version is that the sentence:

"jefferson was both the writer of the declaration of independence"

presents jefferson as both a subject and an agent for the verb "write" because if he was "the writer" then the declaration of independence was written by him, besides that fact, the sentence presents a dependent clause.

while the second sentence:

he was the nation's third president.

presents a basic subject+verb+object structure

so, to give a proper balance to the structure, or better said, to give a parallel structure, we must write a basic s+v+o structure in both sentences:

jefferson wrote the declaration of independence, and he was the nation third president.

elon musk, ceo of spacex, a startup space company is planning to head to mars by 2023. nasa is planning to go to mars at around 2025. both are just for a basic colony.

a term is used to describe a sudden revelation in a short story is "showing forth".

i would need the available options to be listed to give you an answer.