To create a mysterious mood.
Answer:
B
Explanation:
The biuret solution will turn from blue to purple when it is exposed to protein. The copper sulfate and potassium hydroxide cause the substance to become an alkaline.
C<span>ondensation plays a significant role in the formation of clouds. </span>
Answer: Interventional Study
Explanation: When a treatment group is compared to standard (control) group it is called Interventional Study
