How might aquatic mammals be effective in a natural environment if a cold or outer shell is compromised by population how my bird species be affected

explanation:

plz give me the characteristics.

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.