The presence of organic material in soil makes it more productive for plant growth.

The answer is true.  The organic material serves as nutrients for plants when they are planted in the soil.  It is also a sign of fertility when the soil is rich and makes easier to grow plants in.  Soils that don’t have any organic material are not suitable for planting.

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.

currents is the correct answer.