For the carbon cycle and the nitrogen cycle to function properly, which organisms must always be present? a) decomposers b) herbivores c) parasites d) predators

A. Decomposers and similar types of bacteria are the linchpin between carbon and nitrogen cycles. Without them, organisms wouldn't be able to be returned to the soil and turn into the carbon and nitrogen compounds that fuel each of these processes.

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