Identify which scientist or group of scientists was responsible for making each of the following discoveries. the double-helix structure of dna: the chemical composition of proteins: the monomer of nucleic acids:

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