Which event marked the start of the nuclear arms race?
a.)soviet union's first test of an atomic bomb in 1949
b.) united states' first test of a hydrogen bomb in 1952
c.) soviet union's launching of sputnik 1 in 1957
d.) cuban missile crisis of 1962

u go to preference and ull see a button that says i want to delete my acc click on it.

copernicus finished the first manuscript of his book, "de revolutionibus orbium coelestium" ("on the revolutions of the heavenly spheres") in 1532. in it, copernicus established that the planets orbited the sun rather than the earth. he laid out his model of the solar system and the path of the planets.

oh i never knew that

explanation:

the constitution divided the powers into three branches because they don’t want to have a king or queen that has all power. to balance the authority and power the constitution distributed power into the three branches.