Which of the following is true about biofuels?
a. they are made from plant materials and animal fats.
b. they are made by directly harnessing energy from the sun.
c. they use energy from water.
d. they use energy from the earth���s core.

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.

as many times as you want