Make you brainliest this is like a really easy question: which of these is the easiest to study? • biofuels • geothermal energy • hydrogen fuel cell • synthetic material alternative fuel – such as hydrocarbons, graphene, etc.

Biofuels for me are the easiest to study

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.