Here I send you an attachment of the complete answer, I hope you're able to open it.
Answer:
No it is not you added a coma
Explanation:
The detail from the excerpt from Amazing Plants demonstrates that it has a comparison text structure is:
"Some give off sweet smells, while others produce nectar." (Option C)
<h3>What is a Comparison Text Structure?</h3>
A comparison text structure is one that includes words that are used to juxtapose one idea or noun with another.
Notice that in this case, the sentence makes reference to some plants viz a viz others, hence the comparison.
Learn more about Comparison Text Structure at:
brainly.com/question/12129548
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