Answer:
color of the strips
Explanation:
According to my research on studies conducted by various medical professionals, I can say that based on the information provided within the question the change in color of the strips is what indicates the presence of a certain chemical property within the urine/body of the individual. There are many strips, each with a different chemical embedded within it to test for different things. The picture below shows many of the most commonly used strips by medical professionals.
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