The district writing assessment focuses on students' effective use of elaborative techniques to support evidence from sources. The standard emphasizes using comprehensive, relevant, and concrete evidence that is smoothly integrated. However, the sample student writing only briefly mentions cosmic rays causing cancer cells without further elaboration. To improve, the student could further explain how cancer is a deadly disease and elaborate on why cosmic rays pose a health risk, providing strong support for the claim that they are a good reason not to travel to Mars.