Which term describes the picture? impermeable:
doesn't allow any
molecules to pass
through
permeable: allows
all molecules to
pass through
selectively
permeable: allows
only certain
molecules to pass
through
all are correct

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.