An increase in the bio diversity of an ecosystem leads to an increase in the productivity

true or false

the answer is c) abandoned properties that are contaminated with hazardous materials.

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.