What were three reasons why the trenches were difficult to live in?

he government should regulate the economy

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.

there are many answers to this question, such as a diplomat, ambassador, soldier, united nations employee, cia, etc.