How did the Roman Empire (27 BCE) and the Han Dynasty (206 BCE) contribute to develope the Silk Road?

Rachel carson 1962 silent spring was a groundbreaking work regarding what topic

Aside from low birthrates and high death rates, what can cause a country’s population to decline

Ascientist performs an experiment where she measures the mass of a piece of metal, pours acid onto the metal, washes the metal, and then re-measures the mass of the metal. the scientist repeats the experiment several times, each time increasing the amount of acid used. the dependent variable in the experiment is the: initial mass of the metal final mass of the metal amount of acid used washing the metal