The element present in every organic compound is a) calcium. b) carbon. c) iron. d) oxygen.

B) Carbon
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The truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey

The answer is joseph is observing the colour of the reaction mixture to see whether proteins are present in the given solution.