How can a population decrease in size?
A) decreased birthrate and emigration.
B) emigration and increased birthrate.
C) increased death rate and immigration
D) immigration rate equal to the emigration rate

newly independent countries of the former ussr

march 8, 1917

explanation:

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.