Scientific theories are based on which of the following? - general assumptions of how systems work
- mathematical principles that can be proven true
- large amounts of data and evidence collected over time
- observations from within only one scientific discipline

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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.

true is the