Answer:
Paragraph unity
Step-by-step explanation:
Paragraph unity is one of the elements to take into account when constructing an effective paragraph, especially in essays. And in order to achieve it, a writer must focus the whole paragraph on a single topic, also called topic sentence, which it's the controlling idea of the paragraph and they must include sentences whose contents relate clearly to the topic sentence, meaning that if the paragraph begins with one idea, it should not end with another or wander between different ideas.