All other sentences in that paragraph must be relevant to the topic sentence. The paragraphs are well developed. Conclusion must be at least one paragraph. Conclusion reasserts the viewpoint and gives the essay closure. Sentences are clear, complete, expressive, and varied in form and length.
Word choice is appropriate for audience and purpose.
There are no deficiencies in grammar, punctuation, spelling, and usage. Your essay has been carefully proofread. During revision, you have read this essay out loud to yourself to catch errors. Your essay is 600 minimum to 800 words maximum or approximately three pages.