In a xanthoproteic test, if the color of the substance changes to yellow after adding nitric acid, the substance is a

In a xanthoproteic test, if the color of the substance changes to yellow after adding nitric acid, the substance is a protein.

But, from what I was learning, I believe that it's hard to find a single protein as you would go through that test, so, you'd have to look very close and know what you're doing in order to find one.

drink water

explanation:

cash registers don't need water because they are not alive.

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