Why do island chains provide ideal conditions for adaptive radiation to occur?

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

D. peatlands,grassland,swamps

When scientist examine data such as historical documents, they are using the "scientific methods"