2. How did dark matter affect the development of structures in the early universe?(1 point) It cooled pockets of gas to form nebulae.
It became part of black holes.
It seeded the development of quasars.
It seeded the development of galaxies.

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