Once a true cell was formed, biological evolution began. biological evolution is all the changes that have occurred in living things since the beginning of life due to differential reproductive success

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The answer is Living things have all evolved from a common ancestor.

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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.