Evolution does not occur in a straight line with one species another in a series of orderly steps

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 tricuspid valve is present between right atrium and right ventricle