Answer:
Water sample showing pink/purple color is an error.
Explanation:
Biuret is a blue color reagent that changes its color to pink/purple whenever it detects protein in a sample. Water don't contain proteins so it should not show pink/purple color instead it should maintain the blue color. Food items generally contain proteins so it show pink/purple color but it showed blue color.
Error might have caused by wrong marking of the samples, test tube marked with Water might contain a mystery food while Mystery food tube might contain water.
Organisms who happen to be best suited to an environment and reproduce most successfully will be consider successful in terms of natural selection.
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<em>Merit-Ptah
</em></h2>
<em>Ancient history. The involvement of women in the field of medicine has been recorded in several early civilizations. An ancient Egyptian physician, Merit-Ptah ( c. 2700 BC), described in an inscription as "chief physician", is the earliest known female scientist named in the history of science.</em>
The way that the U.S Government promote economic growth is : B. By decreasing taxes and increased spending
Decreasing taxes and increased government spending will attract more investment which will open various job opportunities, which will eventually lead to economic growth
hope this helps
