Which geologic period lasted for almost 7/8 of earth’s history?
a.
the precambrian time
b.
the quaternary period
c.
the carboniferous period
d.
the phanerozoic eon

It was the Precambrian time that lasts 7/8 of the earths history. So, A.

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