Answer:
Hi there!
The answer you are looking for would be unity.
So this would read: To preserve unity, make sure that all sentences in a paragraph directly support the topic sentence
Step-by-step explanation:
The unity in writing is where you make sure that there is something that connects sentences together in a logical way, making the text come together grammatically and making sense. Therefore, to preserve the text's unity, we must make sure that all sentences in a paragraph directly support the topic sentence.