How can we review the structure of the DNA?

Answer is in the file below

is.gd/qKzpBU

answer; i believe that the correct answer is(d) nondisjunction during meiosis;

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.